diff -r 79b222c29887 -r f655dafb741e web/res/js/tracemanager.js
--- a/web/res/js/tracemanager.js	Thu Apr 12 17:55:56 2012 +0200
+++ b/web/res/js/tracemanager.js	Fri Apr 13 19:19:53 2012 +0200
@@ -43,7 +43,7 @@
                      // Swap " (very frequent, which will be
                      // serialized into %22) and ; (rather rare), this
                      // saves some bytes
-                     data = data.replace(/[;"]/g, function(s){ return s == ';' ? '"' : ';'; }).replace(/#/g, '%23');
+                     data = data.replace(/[;"#]/g, function(s){ return s == ';' ? '"' : ( s == '"' ? ';' : '%23'); });
                      // FIXME: check data length (< 2K is safe)
                      var request=$('<img />').error( function() { this.failureCount += 1; })
                          .load( function() { this.failureCount = 0; })
@@ -347,7 +347,7 @@
          list_attribute_types: function() {
              var result = [];
              for (var prop in this.attributes) {
-                 if (this.hasOwnProperty(prop))
+                 if (this.attributes.hasOwnProperty(prop))
                      result.push(prop);
              }
              /* FIXME: we return URIs here instead of AttributeType elements */
@@ -420,7 +420,7 @@
                  "subject": this.subject
              };
              for (var prop in this.attributes) {
-                 if (this.hasOwnProperty(prop))
+                 if (this.attributes.hasOwnProperty(prop))
                      r[prop] = this.attributes[prop];
              }
              return r;
@@ -432,7 +432,6 @@
           */
          toCompactJSON: function() {
              var r = {
-                 "@i": this.id,
                  "@t": (this.trace.shorthands.hasOwnProperty(this.type) ? this.trace.shorthands[this.type] : this.type),
                  "@b": this.begin,
                  "@s": this.subject
@@ -441,8 +440,12 @@
              if (this.begin !== this.end)
                  r["@d"] = this.end - this.begin;
 
+             // Store id only if != ""
+             if (this.id !== "")
+                 r["@i"] = this.id;
+
              for (var prop in this.attributes) {
-                 if (this.hasOwnProperty(prop))
+                 if (this.attributes.hasOwnProperty(prop))
                  {
                      var v = this.attributes[prop];
                      r[prop] = this.trace.shorthands.hasOwnProperty(v) ? this.trace.shorthands[v] : v;