diff --git a/html/force.css b/html/force.css
index f79152f..b4141ac 100644
--- a/html/force.css
+++ b/html/force.css
@@ -8,11 +8,17 @@
   color: #333;
 }
 
-line.link {
+.link line {
   stroke: #333;
   stroke-opacity: 1;
 }
 
+.link .label {
+  fill: transparent;
+  stroke: #C83771;
+  stroke-width: 1px;
+}
+
 .strength {
   font-size: 10px;
   fill: #C83771;
diff --git a/html/force.js b/html/force.js
index 4cb07cf..2df8ffd 100644
--- a/html/force.js
+++ b/html/force.js
@@ -1,300 +1,304 @@
-function zigzag_amplitude(d) {
-  return d.amplitude;
-}
-
-function zigzag_len(d) {
-  return d.len;
-}
-
-function zigzag_angularFrequency(d) {
-  return d.angularFrequency;
-}
-
-d3.svg.zigzag = function() {
-  var amplitude = zigzag_amplitude,
-      len = zigzag_len,
-      angularFrequency = zigzag_angularFrequency;
-
-  function zigzag() {
-    var A = amplitude.apply(this, arguments),
-        l = len.apply(this, arguments),
-        ω = angularFrequency.apply(this, arguments) + 1;
-
-    start = -l/2;
-    end = l/2;
-
-    step = l/ω;
-
-    var s = "M" + start + ",0"
-
-    for (var i = 1; i<ω; i++)
-      s += "L" + (start + i*step) + "," + ((i%2)?A:-A);
-
-    s += "L" + end + ",0"
-
-    return s;
-  }
-
-  zigzag.amplitude = function(v) {
-    if (!arguments.length) return amplitude;
-    amplitude = d3.functor(v);
-    return zigzag;
-  };
-
-  zigzag.len = function(v) {
-    if (!arguments.length) return len;
-    len = d3.functor(v);
-    return zigzag;
-  };
-
-  zigzag.angularFrequency = function(v) {
-    if (!arguments.length) return angularFrequency;
-    angularFrequency = d3.functor(v);
-    return zigzag;
-  };
-
-  return zigzag;
-};
-
-
 function getOffset( el ) {
-  var _x = 0;
-  var _y = 0;
+  var _x = 0, _y = 0
+
   while( el && !isNaN( el.offsetLeft ) && !isNaN( el.offsetTop ) ) {
-    _x += el.offsetLeft - el.scrollLeft;
-    _y += el.offsetTop - el.scrollTop;
-    el = el.offsetParent;
+    _x += el.offsetLeft - el.scrollLeft
+    _y += el.offsetTop - el.scrollTop
+    el = el.offsetParent
   }
-  return { top: _y, left: _x };
+  return { top: _y, left: _x }
 }
 
-var offset = getOffset(document.getElementById('chart'));
+var offset = getOffset(document.getElementById('chart'))
 
 var w = window.innerWidth - offset.left,
     h = window.innerHeight - offset.top,
-    fill = d3.scale.category20();
+    fill = d3.scale.category20()
 
 var cp = d3.select("#chart").append("div")
-.attr("id", "controlpanel");
+           .attr("id", "controlpanel")
 
 var btns = cp.append("div")
-.attr("class", "btn-group")
-.attr("data-toggle", "buttons-radio");
+           .attr("class", "btn-group")
+           .attr("data-toggle", "buttons-radio")
 
 btns.append("button")
-.attr("class", "btn active left")
-.attr("value", "all")
-.text("Alles")
-.on("click", update_graph);
+    .attr("class", "btn active left")
+    .attr("value", "all")
+    .text("Alles")
+    .on("click", update_graph)
 
 btns.append("button")
-.attr("class", "btn right")
-.attr("value", "mesh")
-.text("nur Mesh")
-.on("click", update_graph);
+    .attr("class", "btn right")
+    .attr("value", "mesh")
+    .text("nur Mesh")
+    .on("click", update_graph)
 
 cp.append("label")
-  .text("Knoten hervorheben:");
+  .text("Knoten hervorheben:")
 
-cp.append("br");
+cp.append("br")
 
 cp.append("input")
   .on("keyup", function(){show_node(this.value)})
-  .on("change", function(){show_node(this.value)});
+  .on("change", function(){show_node(this.value)})
 
 function show_node(mac) {
-  d3.selectAll("#chart .node").classed("marked", false);
-  if (mac.length == 0)
-    return;
+  d3.selectAll("#chart .node")
+    .classed("marked", false)
 
-  d3.selectAll("#chart .node").each( function(d) {
-    if (d.id == mac) 
-      d3.select(this).classed("marked", true);
-  })
+  if (mac.length == 0)
+    return
+
+  d3.selectAll("#chart .node")
+    .each( function(d) {
+      if (d.id == mac) 
+        d3.select(this)
+          .classed("marked", true)
+    })
 }
 
-var hashstr = window.location.hash.substring(1);
+var hashstr = window.location.hash.substring(1)
+
+function isConnected(a, b) {
+  return linkedByIndex[a.index + "," + b.index] ||
+         linkedByIndex[b.index + "," + a.index] ||
+         a.index == b.index
+}
+
+function fade(opacity) {
+  return function(d) {
+    vis.selectAll("g.node")
+       .style("stroke-opacity", function(o) {
+         var connected = isConnected(d, o)
+
+         if (connected && opacity != 1)
+           d3.select(this)
+             .classed("highlight", true)
+         else
+           d3.select(this)
+             .classed("highlight", false)
+
+         thisOpacity = connected?1:opacity
+         this.setAttribute('fill-opacity', thisOpacity)
+         return thisOpacity
+       })
+
+    vis.selectAll(".link *")
+       .style("stroke-opacity", function(o) {
+         return o.source === d || o.target === d ? 1 : opacity
+       })
+  }
+} 
+
+function show_node_info(d) {
+  if (typeof nodeinfo !== 'undefined')
+    nodeinfo.remove();
+
+  nodeinfo = d3.select("#chart")
+               .append("div")
+               .attr("id", "nodeinfo")
+  nodeinfo.append("h1")
+          .text(d.name)
+  nodeinfo.append("p")
+          .text("primary: " + d.id)
+  nodeinfo.append("p")
+          .text("macs: " + d.macs)
+  nodeinfo.append("p")
+          .text(d.gps)
+}
 
 function update_graph() {
   var value = jQuery(this).val()
-
-    render_graph(value);
+  update(data, value)
 }
 
-render_graph("all");
+var i, j
 
-function render_graph(type) {
+var vis = d3.select("#chart").append("svg")
+            .attr("width", w)
+            .attr("height", h)
 
-  d3.select("#chart svg").remove();
+vis.append("g").attr("class", "links")
 
-  var vis = d3.select("#chart").append("svg")
-    .attr("width", w)
-    .attr("height", h);
+vis.append("g").attr("class", "nodes")
 
+var linkedByIndex
 
+var force = d3.layout.force()
+              .charge(-100)
+              .gravity(0.02)
+              .friction(0.75)
+              .theta(0.1)
+              .size([w, h])
 
-  d3.json("nodes.json", function(json) {
-    var force = d3.layout.force()
-    .charge(-100)
-    .gravity(0.02)
-    .friction(0.75)
-    .theta(0.1)
-    .linkDistance(function (d) { return d.distance; })
-    .linkStrength(function (d) { return d.strength; })
-    .nodes(json.nodes)
-    .links(json.links)
-    .size([w, h])
-    .start();
+force.on("tick", function() {
+  var link = vis.selectAll(".link")
 
-    var linkedByIndex = {};
+  link.selectAll("line")
+      .attr("x1", function(d) { return d.source.x })
+      .attr("y1", function(d) { return d.source.y })
+      .attr("x2", function(d) { return d.target.x })
+      .attr("y2", function(d) { return d.target.y })
 
-    json.links.forEach(function(d) {
-          linkedByIndex[d.source.index + "," + d.target.index] = 1;
-      });
+  link.selectAll(".label")
+      .attr("transform", function(d) { 
+        π = Math.PI
+        Δx = d.source.x - d.target.x
+        Δy = d.source.y - d.target.y
+        m = Δy/Δx
+        α = Math.atan(m)
+        α += Δx<0?π:0
+        sin = Math.sin(α)
+        cos = Math.cos(α)
+        x = (Math.min(d.source.x, d.target.x) + Math.abs(Δx) / 2)
+        y = (Math.min(d.source.y, d.target.y) + Math.abs(Δy) / 2)
+        return "matrix(" + [cos, sin, -sin, cos, x, y].join(",") + ")"
+      })
 
-    json.links.forEach(function(d) {
-          var node, other;
+  vis.selectAll(".node").attr("transform", function(d) { 
+    return "translate(" + d.x + "," + d.y + ")";
+  })
+})
 
-          if (d.source.group == 2) {
-            node = d.target;
-            other = d.source;
-          }
+var data
 
-          if (d.target.group == 2) {
-            node = d.source;
-            other = d.target;
-          }
-          
-          if (node) {
-            if (node.uplinks === undefined)
-              node.uplinks = new Array();
+d3.json("nodes.json", function(json) {
+  force.linkDistance(function (d) { return d.distance; })
+       .linkStrength(function (d) { return d.strength; })
+       .start()
 
-            node.uplinks.push(other);
-          }
-      });
+  json.links.forEach(function(d) {
+    var node, other
 
-  var linkdata = json.links;
+    if (d.source.group == 2) {
+      node = d.target;
+      other = d.source;
+    }
 
-  if (type == "mesh")
-    linkdata = json.links.filter( function (d) {
-      return d.source.group != 2 && d.target.group != 2 &&
-      d.source.group != 3 && d.target.group != 3;
-    });
+    if (d.target.group == 2) {
+      node = d.source;
+      other = d.target;
+    }
 
+    if (node) {
+      if (node.uplinks === undefined)
+    node.uplinks = new Array();
 
-  var link = vis.selectAll("line.link")
-    .data(linkdata)
-    .enter().append("line")
-    .attr("class", "link")
-    .style("stroke-width", function(d) { return Math.min(1, d.strength * 2); });
+    node.uplinks.push(other);
+    }
+  })
 
-  var linklabel = vis.selectAll("g")
-    .data(linkdata.filter(function (d) {return d.quality != "TT" && d.quality != "1.000"}))
-    .enter()
-    .append("g")
-    .append("path")
-    .attr("d", d3.svg.zigzag().amplitude(function (d) {
-          return Math.pow((1 - 1/d.quality), 0.5) * 8;
-        }).len(30).angularFrequency(4)
-/*
-        d3.svg.arc().outerRadius(5).innerRadius(0)
-         .startAngle( function (d) {
-            return Math.PI/d.quality - Math.PI/2;
-          })
-         .endAngle( function (d) {
-            return -Math.PI/d.quality - Math.PI/2;
-          })
-          */
-        )
-    .attr("fill", "transparent")
-    .attr("stroke", "#C83771")
-    .attr("stroke-width", "1px")
+  data = json;
 
-      function isConnected(a, b) {
-            return linkedByIndex[a.index + "," + b.index] || linkedByIndex[b.index + "," + a.index] || a.index == b.index;
-        }
+  update(data, "all")
+})
 
+function update(src, type) {
+  var linkdata = data.links;
 
-   function fade(opacity) {
-            return function(d) {
-                  node.style("stroke-opacity", function(o) {
-        var connected = isConnected(d, o);
+  var links = force.links(data.links
+                   .filter(function (d) {
+                     return type != "mesh" ||
+                            d.source.group != 2 &&
+                            d.source.group != 3 &&
+                            d.target.group != 2 &&
+                            d.target.group != 3
+                   })
+               ).links()
 
-        if (connected && opacity != 1)
-        d3.select(this).classed("highlight", true);
-        else
-        d3.select(this).classed("highlight", false);
+  var link = vis.select("g.links")
+                .selectAll("g.link")
+                .data(links, function(d) {
+                    return d.id || (d.id = ++j)
+                })
 
-                      thisOpacity = connected ? 1 : opacity;
-                      this.setAttribute('fill-opacity', thisOpacity);
-                      return thisOpacity;
-                  });
+  var linkEnter = link.enter().append("g")
+                      .attr("class", "link")
 
-                  link.style("stroke-opacity", function(o) {
-                        return o.source === d || o.target === d ? 1 : opacity;
-                    });
-                  linklabel.style("opacity", function(o) {
-                        return o.source === d || o.target === d ? 1 : opacity;
-                    });
-              };
-        } 
+  linkEnter.append("line")
+    .style("stroke-width", function(d) {
+      return Math.min(1, d.strength * 2)
+    })
 
-  function show_node_info(d) {
-    if (!(typeof nodeinfo === 'undefined')) 
-      nodeinfo.remove();
+  linkEnter.filter(function (d) {
+        return d.quality != "TT" && d.quality != "1.000"
+      })
+      .append("path")
+      .attr("class", "label")
+      .attr("d", d3.svg.zigzag()
+                       .amplitude(function (d) {
+                         return Math.pow((1 - 1/d.quality), 0.5) * 8;
+                       })
+                       .len(30)
+                       .angularFrequency(4)
+      )
 
-    nodeinfo = d3.select("#chart").append("div")
-      .attr("id", "nodeinfo");
+  link.exit().remove()
 
-    nodeinfo.append("h1")
-      .text(d.name);
+  var nodes = force.nodes(data.nodes
+                .filter(function (d) {
+                  return type != "mesh" ||
+                        (d.group != 2 && d.group != 3)
+                })
+              ).nodes()
 
-    nodeinfo.append("p")
-      .text("primary: " + d.id);
+  var node = vis.select("g.nodes")
+                .selectAll("g.node")
+                .data(nodes,
+                  function(d) {
+                    return d.id || (d.id = ++i)
+                  }
+                )
+  var nodeEnter = node.enter().append("g")
+                .attr("class", "node")
+                .on("mouseover", fade(.2))
+                .on("mouseout", fade(1))
+                .on("click", show_node_info)
+                .call(force.drag)
 
-    nodeinfo.append("p")
-      .text("macs: " + d.macs);
+  nodeEnter.append("ellipse")
+    .attr("rx", function(d) {
+      if (d.group == 3) return 4
+      else return Math.max(10, d.name.length * 5)
+    })
+    .attr("ry", function(d) {
+      if (d.group == 3) return 4
+      else return 10
+    })
+    .style("fill", function(d) {
+      if (d.group == 3) return fill(d.group)
+      else return ""
+    })
+    .style("stroke", function(d) {
+      return fill(d.group)
+    })
 
-    nodeinfo.append("p")
-      .text(d.gps);
-  }
-
-  var node = vis.selectAll("svg.node")
-    .data(json.nodes.filter(function (d) {
-      return type != "mesh" || (d.group != 2 && d.group != 3);
-    }))
-  .enter().append("g")
-    .attr("class", "node")
-    .on("mouseover", fade(.2))
-    .on("mouseout", fade(1))
-    .on("click", show_node_info)
-    .call(force.drag);
-
-  node.append("ellipse")
-    .attr("rx", function(d) { if (d.group == 3) return 4; else return Math.max(10, d.name.length * 5); })
-    .attr("ry", function(d) { if (d.group == 3) return 4; else return 10; })
-    .style("fill", function(d) { if (d.group == 3) return fill(d.group); else return ""; })
-    .style("stroke", function(d) { return fill(d.group); });
-
-  node.append("text")
+  nodeEnter.filter(function(d) {
+      return d.group != 3
+    })
+    .append("text")
     .attr("text-anchor", "middle")
     .attr("y", "4px")
-    .text(function(d) { if (d.group == 3) return ""; else return d.name; });
+    .text(function(d) { return d.name })
 
-  node.append("title")
-    .text(function(d) { return d.macs; });
+  nodeEnter.append("title")
+    .text(function(d) { return d.macs })
 
   if (type == "mesh") {
     var uplink_info = node.filter(function (d) {
       if (d.uplinks !== undefined)
-        return d.uplinks.length > 0;
+      return d.uplinks.length > 0;
       else
-        return false;
+      return false;
     })
     .append("g");
 
     uplink_info.append("path")
-      .attr("d","m -2.8850049,-13.182327 c 7.5369165,0.200772 12.1529864,-1.294922 12.3338513,-10.639456 l 2.2140476,1.018191 -3.3137621,-5.293097 -3.2945999,5.20893 2.4339957,-0.995747 c -0.4041883,5.76426 -1.1549641,10.561363 -10.3735326,10.701179 z")
+      .attr("d","m -2.8850049,-13.182327"
+          + "c 7.5369165,0.200772 12.1529864,-1.294922 12.3338513,-10.639456"
+          + "l 2.2140476,1.018191 -3.3137621,-5.293097 -3.2945999,5.20893 2.4339957,-0.995747"
+          + "c -0.4041883,5.76426 -1.1549641,10.561363 -10.3735326,10.701179 z")
       .style("fill", "#333");
 
     uplink_info.append("text")
@@ -303,32 +307,16 @@ function render_graph(type) {
       .text(function (d) {return d.uplinks.length});
   }
 
-  force.on("tick", function() {
-    link.attr("x1", function(d) { return d.source.x; })
-    .attr("y1", function(d) { return d.source.y; })
-    .attr("x2", function(d) { return d.target.x; })
-    .attr("y2", function(d) { return d.target.y; });
+  node.exit().remove()
 
-    linklabel
-    .attr("transform", function(d) { 
-      π = Math.PI;
-      Δx = d.source.x - d.target.x;
-      Δy = d.source.y - d.target.y;
-      m = Δy/Δx;
-      α = Math.atan(m);
-      α += Δx<0?π:0;
-      sin = Math.sin(α);
-      cos = Math.cos(α);
-      x = (Math.min(d.source.x, d.target.x) + Math.abs(Δx) / 2)
-      y = (Math.min(d.source.y, d.target.y) + Math.abs(Δy) / 2)
-      return "matrix(" + [cos, sin, -sin, cos, x, y].join(",") + ")";
-    });
+  force.start()
 
-  node.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
-  });
+  linkedByIndex = {}
+
+  links.forEach(function(d) {
+    linkedByIndex[d.source.index + "," + d.target.index] = 1
+  })
 
   if (hashstr.length != 0)
-    show_node(hashstr);
-  });
-
+    show_node(hashstr)
 }
diff --git a/html/nodes.html b/html/nodes.html
index 3786d5a..30fb894 100644
--- a/html/nodes.html
+++ b/html/nodes.html
@@ -10,6 +10,7 @@
     <script type="text/javascript" src="d3.js"></script>
     <script src='d3.layout.js' type='text/javascript'> </script>
     <script src='d3.geom.js' type='text/javascript'> </script>
+    <script type="text/javascript" src="zigzag.js"></script>
   </head>
   <body>
     <header>
diff --git a/html/zigzag.js b/html/zigzag.js
new file mode 100644
index 0000000..66a8803
--- /dev/null
+++ b/html/zigzag.js
@@ -0,0 +1,57 @@
+function zigzag_amplitude(d) {
+  return d.amplitude;
+}
+
+function zigzag_len(d) {
+  return d.len;
+}
+
+function zigzag_angularFrequency(d) {
+  return d.angularFrequency;
+}
+
+d3.svg.zigzag = function() {
+  var amplitude = zigzag_amplitude,
+      len = zigzag_len,
+      angularFrequency = zigzag_angularFrequency;
+
+  function zigzag() {
+    var A = amplitude.apply(this, arguments),
+        l = len.apply(this, arguments),
+        ω = angularFrequency.apply(this, arguments) + 1;
+
+    start = -l/2;
+    end = l/2;
+
+    step = l/ω;
+
+    var s = "M" + start + ",0";
+
+    for (var i = 1; i<ω; i++)
+      s += "L" + (start + i*step) + "," + ((i%2)?A:-A);
+
+    s += "L" + end + ",0";
+
+    return s;
+  }
+
+  zigzag.amplitude = function(v) {
+    if (!arguments.length) return amplitude;
+    amplitude = d3.functor(v);
+    return zigzag;
+  };
+
+  zigzag.len = function(v) {
+    if (!arguments.length) return len;
+    len = d3.functor(v);
+    return zigzag;
+  };
+
+  zigzag.angularFrequency = function(v) {
+    if (!arguments.length) return angularFrequency;
+    angularFrequency = d3.functor(v);
+    return zigzag;
+  };
+
+  return zigzag;
+};