Javascript+dom Tree Menu class, hope Friends to progress _javascript skills

More than the tree menu JS Online is that they wrote a tree menu category, since that is not bad, open everyone to share and explore, and everyone to progress the most happy!!
/* Kuomart.com__mykuomart, Create by Ybcola (at) 163.com, 2006-7-2
Last Modified 2006-7-2, ybcola@163.com *
<!--
function Dtree () {
This. Menugroupclose= "Images/treeview_close.gif"; Menu Close icon
This. Menugroupopen= "Images/treeview_open.gif"; Menu Open icon
This. Menuitemclass= ""; menu item Style
This. Menuiteminfoclass= ""; Menu link Style
This. Menuitemlpad= "12px";//Sub Menu indent kernel value
This. Defaultgroupstate=false; Default state when menu is assembled
document.write ("<div id=\" treeroot\ "></div>");
This. Node=document.getelementbyid ("Treeroot");
0 node dom to image, array 1 for the connection display, 2 for connection href,3 for connection target,4 for connection display front icon
This. Additem=function (Menuinfo) {
var div=creatediv ();
var div1=creatediv ();
var ico=[this. Menugroupclose,this. Menugroupopen];
Div.classname=this. Menuitemclass;
Div1.style.marginleft=this. Menuitemlpad;
Div1.style.display=this. Defaultgroupstate "": "None";
var node=menuinfo[0]?menuinfo[0][1]:this. Node;
var iteminfo= "";
if (menuinfo[4]) iteminfo= "if (menuinfo[2]) iteminfo+= "<a href=\" "+menuinfo[2]+" \ "target=\" "+menuinfo[3]+" \ "class=\" "+this". Menuiteminfoclass+ ">";
ITEMINFO+=MENUINFO[1];
if (menuinfo[2]) iteminfo+= "</a>";
Div.innerhtml=iteminfo;
Node.appendchild (DIV);
Node.appendchild (DIV1);
if (Menuinfo[0]) {
if (!menuinfo[0][0].havechild) {
var as=document.createelement ("img");
AS.SRC=ICO[1];
As.align= "Absmiddle";
As.onclick=function () {
Swapshow (Node,as,ico);
}
Menuinfo[0][0].insertbefore (As,menuinfo[0][0].firstchild);
As.insertadjacenttext ("Afterend", "");
Menuinfo[0][0].havechild=true;
}
}
return [DIV,DIV1];
}

function Creatediv () {
var div=document.createelement ("div");
return div;
}

function Swapshow (obj,ico,oo) {
if (obj.style.display!= "") {
Obj.style.display= "";
ICO.SRC=OO[0];
}
else{
Obj.style.display= "None";
ICO.SRC=OO[1];
}
}
}
-->