function initMaps() {
	   if (document.getElementById) {
	      var mapIds = initMaps.arguments;    // pass string IDs of containing map elements
	      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++) {  // loop thru area elements
	           area = areas[j];
	           area.onmousedown = imgSwap;    // set event handlers
	           area.onmouseout = imgSwap;
	           area.onmouseover = imgSwap;
	           area.onmouseup = imgSwap;
	        }
	      }
	   }
	}

	// image swapping event handling
	function imgSwap(evt) {
	   evt = (evt) ? evt : event;                   // equalize event models
	   var elem = (evt.target) ? evt.target : evt.srcElement;
	   var imgClass = elem.parentNode.name;         // get map element name
	   var coords = elem.coords.split(",");         // convert coords to clip
	   var clipVal = "rect(" + coords[1] + "px " +
	                           coords[2] + "px " +
	                           coords[3] + "px " +
	                           coords[0] + "px)";
	   var imgStyle;
	   //alert ("elem = " + elem + ", imgClass = " + imgClass + ", event type = " + evt.type);
	   switch (evt.type) {
	      case "mousedown" :
	         imgStyle = document.getElementById(imgClass + "Down").style;
	         imgStyle.clip = clipVal;
	         imgStyle.visibility = "visible";
	         break;
	      case "mouseout" :
	         document.getElementById(imgClass + "Over").style.visibility = "hidden";
	         document.getElementById(imgClass + "Down").style.visibility = "hidden";
	         break;
	      case "mouseover" :
	         imgStyle = document.getElementById(imgClass + "Over").style;
	         imgStyle.clip = clipVal;
	         imgStyle.visibility = "visible";
	         break
	      case "mouseup" :
	         document.getElementById(imgClass + "Down").style.visibility = "hidden";
	         // guarantee click in IE
	         if (elem.click) {
	             elem.click();
	         }
	         break;
	   }
	   evt.cancelBubble = true;
	   return false;
	}