function initMaps() {
   if (document.getElementById) {
      var mapIds = initMaps.arguments;
      var i, j, area, areas;
      for (i = 0; i < mapIds.length; i++) {
        areas = document.getElementById(mapIds[i]).getElementsByTagName("area");
        for (j = 0; j < areas.length; j++) {
           area = areas[j];
           area.onmouseout = imgSwap;
           area.onmouseover = imgSwap;
        }
      }
   }
}
function imgSwap(evt) {
   evt = (evt) ? evt : event;
   var elem = (evt.target) ? evt.target : evt.srcElement;
   var imgClass = elem.parentNode.name;
   var coords = elem.coords.split(",");
   var clipVal = "rect(" + coords[1] + "px " + coords[2] + "px " + coords[3] + "px " + coords[0] + "px)";
   var imgStyle;

	switch (evt.type) {
      case "mouseout" :
         document.getElementById(imgClass + "Over").style.visibility = "hidden";
         break;
      case "mouseover" :
         imgStyle = document.getElementById(imgClass + "Over").style;
         imgStyle.clip = clipVal;
         imgStyle.visibility = "visible";
         break
   }
   evt.cancelBubble = true;
   return false;
}