Open nodes dynamicaly

Is there any way to open limited number of levels of tree dynamicaly? I mean tree with dynamical loading… Starting from specified node…

I extended tree object with the following method, which does the job. Try it…
dhtmlXTreeObject.prototype.openLevelsDynamic = function(itemId,depth){    if(!itemId)     itemId = this.tmpValueForDynLevelsItemId    var tmpAr = this.getAllSubItems(itemId).split(",");    tmpAr[tmpAr.length] = itemId;    var outAr = new Array(0);    for(var i=0;i<tmpAr.length;i++){     if(this.hasChildren(tmpAr[i])===true)      outAr[outAr.length] = tmpAr[i]    }    if(depth){     this.tmpValueForDynLevels = depth-1;     this.tmpValueForDynLevelsItemId = itemId||tree.rootId     this.attachEvent(“onOpenDynamicEnd”,function(){      if(this.tmpValueForDynLevels>0)       this.openLevelsDynamic();      this.tmpValueForDynLevels = this.tmpValueForDynLevels-1;     })     }    if(outAr.length>0)     this.openItemsDynamic(outAr.join(","));   }