function Offset(e)
//取标签的绝对位置
{
    var t = e.offsetTop;
    var l = e.offsetLeft;
    var w = e.offsetWidth;
    var h = e.offsetHeight-2;
    while(e=e.offsetParent)
    {
        t+=e.offsetTop;
        l+=e.offsetLeft;
    }
    return {
        top : t,
        left : l,
        width : w,
        height : h
    }
}
function getoffset(e) 
{  
 var t=document.getElementById("projname").offsetTop;  
 var l=document.getElementById("projname").offsetLeft;  
 var w = document.getElementById("projname").offsetWidth;
 var h = document.getElementById("projname").offsetHeight-2;
 var rec = new Array(1); 

 rec[0]  = t+h; 
 rec[1] = l; 
 return rec 
}  
function hidecontext()
{
	if(document.getElementById("selectchildnewcode").style.display!="none") document.getElementById("selectchildnewcode").style.display="none";
}
function loadSelect(obj)
{
	if(document.getElementById("selectofnewcode")!=null)document.getElementById("selectofnewcode").parentNode.removeChild(document.getElementById("selectofnewcode"));
	if(document.getElementById("selectchildnewcode")!=null)document.getElementById("selectchildnewcode").parentNode.removeChild(document.getElementById("selectchildnewcode"));
	if(document.getElementById("uUlchildnewcode")!=null)document.getElementById("uUlchildnewcode").parentNode.removeChild(document.getElementById("uUlchildnewcode"));
	var offset=Offset(document.getElementById("projname"));
	var offs=getoffset(obj);
	obj.style.display="none";
	var iDiv = document.createElement("div");
        iDiv.id="selectof" + obj.name;
        iDiv.style.position = "absolute";
        iDiv.style.width=offset.width + "px";
        iDiv.style.height=offset.height + "px";
        iDiv.style.top=offset.top + "px";
        iDiv.style.left=offset.left + "px";
        //iDiv.style.background="url(icon_select.gif) no-repeat right 4px";
        iDiv.style.border="1px solid #3366ff";
        iDiv.style.fontSize="12px";
        iDiv.style.lineHeight=offset.height + "px";
        iDiv.style.textIndent="4px";
        iDiv.style.display="none";
    document.body.appendChild(iDiv);
	iDiv.innerHTML=obj.options[obj.selectedIndex].innerHTML;
	//document.getElementById("projname").value=obj.options[obj.selectedIndex].innerHTML;
	iDiv.onmouseover=function(){//鼠标移到
       // iDiv.style.background="url(icon_select_focus.gif) no-repeat right 4px";
    }
    iDiv.onmouseout=function(){//鼠标移走
        //iDiv.style.background="url(icon_select.gif) no-repeat right 4px";
    }
    obj.onblur=function(){//鼠标移走
if(document.getElementById("selectchildnewcode").style.display!="none") document.getElementById("selectchildnewcode").style.display="none";
    }
	if (document.getElementById("selectchild" + obj.name)){
	//判断是否创建过div
		if (childCreate){
			//判断当前的下拉是不是打开状态，如果是打开的就关闭掉。是关闭的就打开。

			document.getElementById("selectchild" + obj.name).style.display="";
			childCreate=true;
		}else{
			document.getElementById("selectchild" + obj.name).style.display="";
			childCreate=true;
		}
	}else{
		//初始一个div放在上一个div下边，当options的替身。

		var cDiv = document.createElement("div");
		cDiv.id="selectchild" + obj.name;
		cDiv.style.position = "absolute";
		cDiv.style.width="120px";
		cDiv.style.height="150px";
		cDiv.style.overflow="auto";
		cDiv.style.top=offset.top+offset.height-2 + "px";
		cDiv.style.left=offset.left + "px";
		cDiv.style.background="#f7f7f7";
		cDiv.style.border="1px solid silver";
		var uUl = document.createElement("ul");
		uUl.id="uUlchild" + obj.name;
		uUl.style.listStyle="none";
		uUl.style.margin="0";
		uUl.style.padding="0";
		uUl.style.fontSize="12px";
		cDiv.appendChild(uUl);
		document.body.appendChild(cDiv);        
		childCreate=true;
		for (var i=0;i<obj.options.length;i++){
			//将原始的select标签中的options添加到li中

			var lLi=document.createElement("li");
			lLi.id=obj.options[i].value;
			lLi.style.textIndent="4px";
			lLi.style.height="20px";
			lLi.style.lineHeight="20px";
			lLi.innerHTML=obj.options[i].innerHTML;
			uUl.appendChild(lLi);
		}
		var liObj=document.getElementById("uUlchild" + obj.name).getElementsByTagName("li");
		for (var j=0;j<obj.options.length;j++){
			//为li标签添加鼠标事件
			liObj[j].onmouseover=function(){
				this.style.background="gray";
				this.style.color="white";
			}
			liObj[j].onmouseout=function(){
				this.style.background="white";
				this.style.color="black";
			}
			liObj[j].onclick=function(){
				//做两件事情，一是将用户选择的保存到原始select标签中，要不做的再好看表单递交后也获取不到select的值了。

				obj.options.length=0;
				obj.options[0]=new Option(this.innerHTML,this.id);
				//同时我们把下拉的关闭掉。

				document.getElementById("selectchild" + obj.name).style.display="none";
				childCreate=false;
				iDiv.innerHTML=this.innerHTML;
				document.getElementById("projname").value=obj.options[obj.selectedIndex].innerHTML;
			}
		}
		if(window.attachEvent) document.attachEvent("onclick",hidecontext);
		else document.addEventListener("click",hidecontext,false);

	}
    
}