function MyTreeView(divId, urlprefix, nodeclick, myurlhead) {

 var tree;

 this.loadNodeData=function (node, fnLoadComplete)  {
   var nodeID;
   if(fnLoadComplete === undefined ) { nodeID=""; }
   else                              { nodeID = encodeURI(node.data.id); }

   var sUrl = urlprefix + nodeID;
   var callback = {
            
      success: function(oResponse) {
         var mynode=oResponse.argument.node;
         var oResults = eval("(" + oResponse.responseText + ")");
         if((oResults.ResultSet) && (oResults.ResultSet.length)) {
            if(YAHOO.lang.isArray(oResults.ResultSet)) 
			{
              for (var i=0, j=oResults.ResultSet.length; i<j; i=i+1) 
			  {
			    var tmpnodeobj = oResults.ResultSet[i];
			    var myobj = { label: tmpnodeobj[0], id:tmpnodeobj[1], href:myurlhead+"#"+tmpnodeobj[1]  }; 
                new YAHOO.widget.TextNode(myobj, mynode, false);
              }
            } 
			else 
			{
		      var myobj2 = { label: oResults.ResultSet[0], id:oResults.ResultSet[1], href:myurlhead+"#"+oResults.ResultSet[1] }; 
			  new YAHOO.widget.TextNode(myobj2, mynode, false);
            }
         }

         if(oResponse.argument.fnLoadComplete !== undefined )
           {   oResponse.argument.fnLoadComplete();  }
	     else
  		   {  
  		       tree.draw();
  		       //YAHOO.widget.TreeView.getNode(divId,1).toggle();   
  		   }
      },
                
      failure: function(oResponse) {
           if(oResponse.argument.fnLoadComplete !== undefined )
              { oResponse.argument.fnLoadComplete(); }
	       else
  			  {  tree.draw();  }
         },
                
         argument: {
                    "node": node,
                    "fnLoadComplete": fnLoadComplete
         },
                
         timeout: 10000
     };
            
     YAHOO.util.Connect.asyncRequest('GET', sUrl, callback);
   };

   this.buildTree=function () {
	  tree = new YAHOO.widget.TreeView(divId);
      tree.setDynamicLoad(this.loadNodeData, 1);
      var root = tree.getRoot();
	  this.loadNodeData(root);
	  tree.draw();
      tree.subscribe("labelClick", nodeclick); 
   };

   this.buildTree();
}