window.onload = function() {
	/* Associate logo's onclick event with home page */
	var centralsign = document.getElementById('centralsign');
	if (centralsign != null)
	{
		centralsign.onclick = function() 
		{
			window.location='index.php';
			return false;
		}
	}
	
	// Rollover images in rightcolumn
	navRoot = document.getElementById("rightcolumn");
	if (navRoot != null)
	{
		for (i=0; i< navRoot.childNodes.length; i++) 
		{
			node = navRoot.childNodes[i];
			if (node.nodeName=="A") 
			{
				for (a=0; a< node.childNodes.length; a++) 
				{
					childnode = node.childNodes[a];
					if (childnode.className == "rollover") 
					{
						childnode.onmouseover = function() 
						{
							this.src = this.src.replace(".gif", "%20hover.gif");
						}
						
						childnode.onmouseout = function() 
						{
							this.src = this.src.replace("%20hover.gif", ".gif");
						}
					}
				}
			}
		}
	}
}