// JavaScript Document

function swap_image( event, image_url ) {
   var e = event || window.event;
  
   // test for W3C or IE event object to get event node information
   if( e.target )
     var node = e.target;
   else
     var node = e.srcElement;

   // test to see if there is a valid dom node
   if( node )
     // If the node is an IMG node then a mouse event ocuured and use the event node to change images
     if( node.tagName == "IMG" )
      node.src = image_url;
      // Else the node is a focus event and on the A element is the event node and need to get the child image node to do image swap  
   else
      node.getElementsByTagName("img")[0].src = image_url;
    
   return false;
  
}