解决div不能覆盖select的问题！

解决div不能覆盖select的问题！

我写了个函数，当鼠标移动到div上，自动隐藏冲突的select,移开后在显示被隐藏的select.在onMouseOver上执行hideConflict(this),... ...
函数如下：作者阿龙，WEB开发网 http://www.webkaifa.com
function hideConflict(divCtl){
arrConflict = new Array();
hideConflictObject("SELECT",divCtl);
  hideConflictObject("OBJECT",divCtl);
}
function showConflict(){
for(var i = 0;i < arrConflict.length;i ++){
  arrConflict[i].style.visibility = "";
}
}
function hideConflictObject(strTagName,divCtl) {
x = divCtl.offsetLeft;
y = divCtl.offsetTop;
h = divCtl.offsetHeight;
w = divCtl.offsetWidth;

for (var i = 0; i < document.all.tags(strTagName).length; i++)
{
 
  var obj = document.all.tags(strTagName)[i];
  if (! obj || ! obj.offsetParent)
   continue;
  var objLeft   = obj.offsetLeft;
  var objTop    = obj.offsetTop;
  var objHeight = obj.offsetHeight;
  var objWidth = obj.offsetWidth;
  var objParent = obj.offsetParent;
 
  while (objParent.tagName.toUpperCase() != "BODY"){
   objLeft  += objParent.offsetLeft;
   objTop   += objParent.offsetTop;
   objParent = objParent.offsetParent;
  }
  var bolHide = true;
  if( obj.style.display == "none" || obj.style.visibility == "hidden" || obj.getAttribute("Author") == "tiannet" ){
   bolHide = false;
  }
  if(  ( (objLeft + objWidth) > x && (y + h + 20) > objTop && (objTop+objHeight) >  y && objLeft < (x+w) ) && bolHide ){
   arrConflict[arrConflict.length] = obj;
   obj.style.visibility = "hidden";
  }
}
}