function findPosX(obj)
{
  var curleft = 0;
  if (obj.offsetParent)
  {
    while (obj.offsetParent)
    {
      curleft += obj.offsetLeft
      obj = obj.offsetParent;
    }
  }
  else if (obj.x)
    curleft += obj.x;
  return curleft-20;
}

function findPosY(obj)
{
  var curtop = 0;
  if (obj.offsetParent)
  {
    while (obj.offsetParent)
    {
      curtop += obj.offsetTop
      obj = obj.offsetParent;
    }
  }
  else if (obj.y)
    curtop += obj.y;
  return curtop;
}
var currPcnNav=null;

function pcnNav(o){
	var offLeft = findPosX(o);
	var offTop = findPosY(o);
	var arrNav=document.getElementById("subNav").getElementsByTagName("ul");
	if (currPcnNav!=null) {
	   hidPcnNav(currPcnNav);
	}
	if (o.getAttribute("urn")!="null" && o.getAttribute("urn")!="") {
		shwPcnNav(document.getElementById(o.getAttribute("urn")),offLeft);
		currPcnNav=document.getElementById(o.getAttribute("urn"));
		document.body.onmouseup=function(){
			hidPcnNav(currPcnNav);
		}
	} else {
	     currPcnNav?hidPcnNav(currPcnNav):"";
	}
}

function shwPcnNav(o,n){
	o.style.display="";
	o.style.left=n+"px";
}

function hidPcnNav(o){//alert(o.getAttribute("id"));
	o.style.display="none";
	document.body.onmouseup=null;
}

function pcnNavInit(){
	var arrNav=document.getElementById("nav").getElementsByTagName("a");
	for (var i=0;i<arrNav.length;i++ ) {
	    //if(!arrNav[i].onmouseover) {
		arrNav[i].onmouseover=function(){
		    pcnNav(this);
		}
		//}
	}
}
//window.onload=pcnNavInit;