function newImage(arg) {
			if (document.images) {
				rslt = new Image();
				rslt.src = arg;
				return rslt;
			}
		}
		function changeImages(imgid,imgsrc) {
			//if (document.images && (preloadFlag == true)) {
				//for (var i=0; i<changeImages.arguments.length; i+=2) {
					document[imgid].src =  imgsrc;
				//}
			//}
		}
		
		var preloadFlag = false;
		

		function preloadImagesPeriodic() {
			if (document.images) {
				mapPeriodic = newImage("/media/images/isotopes/v-periodic-map.gif");
				xe = newImage("/media/images/isotopes/v-periodic-map-xe.gif");
				kr = newImage("/media/images/isotopes/v-periodic-map-kr.gif");
				se = newImage("/media/images/isotopes/v-periodic-map-se.gif");
				te = newImage("/media/images/isotopes/v-periodic-map-te.gif");
				zn = newImage("/media/images/isotopes/v-periodic-map-zn.gif");
				cd = newImage("/media/images/isotopes/v-periodic-map-cd.gif");
				ge = newImage("/media/images/isotopes/v-periodic-map-ge.gif");
				si = newImage("/media/images/isotopes/v-periodic-map-si.gif");
				c = newImage("/media/images/isotopes/v-periodic-map-c.gif");
				pb = newImage("/media/images/isotopes/v-periodic-map-pb.gif");
				sn = newImage("/media/images/isotopes/v-periodic-map-sn.gif");
				ni = newImage("/media/images/isotopes/v-periodic-map-ni.gif");
				fe = newImage("/media/images/isotopes/v-periodic-map-fe.gif");
				ir = newImage("/media/images/isotopes/v-periodic-map-ir.gif");
				w = newImage("/media/images/isotopes/v-periodic-map-w.gif");
				mo = newImage("/media/images/isotopes/v-periodic-map-mo.gif");
				ti = newImage("/media/images/isotopes/v-periodic-map-ti.gif");
				cr = newImage("/media/images/isotopes/v-periodic-map-cr.gif");
				yb = newImage("/media/images/isotopes/v-periodic-info-yb.gif");
				preloadFlag = true;
			}
		}
		
		
		//-- Show/Hide functions --//
function hideAll(lyrId) { 
	var divs = document.getElementsByTagName('div'); 
	for(i=0;i<divs.length;i++){ 
		if(divs[i].id.match(lyrId)){
			divs[i].style.display='none';
		} 
	} 
}

function show(lyrId) {
	document.getElementById(lyrId).style.display='block';
}