startList = function() {
if (document.all&&document.getElementById) {
navRoot = document.getElementById("nav");
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", "");
   }
   }
  }
 }
}
window.onload=startList;


    if (document.images)
    {
      preload_image_object = new Image();
      // set image url
      image_url = new Array();
      image_url[0] = "../images/dropdownMap.gif";
      image_url[1] = "../images/Sub-menu.jpg";
      image_url[2] = "../images/Header.jpg";
      image_url[3] = "../images/left-box-bg.jpg";
    
       var i = 0;
       for(i=0; i<=3; i++) 
         preload_image_object.src = image_url[i];
    }