function imgOn(imgName)
  {
  	document.getElementById(imgName).src = "gui/" + imgName + "_over.gif";
  }
  
	function imgOff(imgName) 
  {
  	document.getElementById(imgName).src ="gui/" + imgName + ".gif";
  }
	
	  
// The hover function:
//  If there is a child sub-menu, show it on mouseover, hide it on mouseout!
var sfHover = function()
{
	var menu = document.getElementById("dropdown");
	if (!menu)
	{
		return;
	}
	var listItems = menu.getElementsByTagName("LI");
	for (var i = 0; i < listItems.length; i++)
	{
		listItems[i].onmouseover = function()
		{
			if (this.getElementsByTagName("UL").length > 0)
			{
				// Show the sub-menu
				this.getElementsByTagName("UL").item(0).style.display = "block";
			}
		}
		listItems[i].onmouseout = function()
		{
			if (this.getElementsByTagName("UL").length > 0)
			{
				// Hide the sub-menu
				this.getElementsByTagName("UL").item(0).style.display = "none";
			}
		}
	}
}


if (window.attachEvent) window.attachEvent("onload", sfHover);