if (document.images)
    {
      
      img1 = new Image();
      img1.src = "images/A_link.jpg";
      img1over = new Image();
      img1over.src = "images/A_mouseover.jpg";
            
      img2 = new Image();
      img2.src = "images/B_link.jpg";
      img2over = new Image();
      img2over.src = "images/B_mouseover.jpg";
            
      img3 = new Image();
      img3.src = "images/C_link.jpg";
      img3over = new Image();
      img3over.src = "images/C_mouseover.jpg";
            
      img4 = new Image();
      img4.src = "images/D_link.jpg";
      img4over = new Image();
      img4over.src = "images/D_mouseover.jpg";
            
      img5 = new Image();
      img5.src = "images/E_link.jpg";
       img5over = new Image();
      img5over.src = "images/E_mouseover.jpg";
      
     
    }
 
// preload images to avoid delays
  
 function changeImg(id,imageName)
 {      
   document.getElementById(id).src=eval(imageName+".src");    
 }      




 
startList = function() { 
	                if (document.all && document.getElementById) {
	                 {
		                 navRoot = document.getElementById("main_menu");
		         }
		for (i=0; i<navRoot.childNodes.length; i++) { 
		
			node = navRoot.childNodes[i];
			
			
  		if (node.nodeName=="LI") { 
				node.onmouseover = function() {
					this.className+=" over"; 
					
				
				}
				node.onmouseout=function() {
					this.className=this.className.replace(" over", "");
					
				}
			}
		}
	}
}