addLoadEvent(init);


function init()
{
	if (document.getElementById)
		var x = document.getElementById('TopNav').getElementsByTagName('IMG');
	else if (document.all)
		var x = document.all['TopNav'].all.tags('IMG');
	else return;
	var preloads = new Object();
	for (var i=0;i<x.length;i++)
	{
	   if (null == x[i].parentNode.getAttribute('href'))
	      continue;
		preloads['ni'+x[i].id] = new Image;
		preloads['ni'+x[i].id].src = 'img/Nav_Sub'+ (i+1) + '_Norm.gif';
		preloads['oi'+x[i].id] = new Image;
		preloads['oi'+x[i].id].src = 'img/Nav_Sub'+ (i+1) + '_Over.gif';
		x[i].onmouseover = function () {this.src=preloads['oi'+this.id].src;}
		x[i].onmouseout = function ()  {this.src=preloads['ni'+this.id].src;}
	}
}

function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}