function cngimg(n){
	var url=location.href;
		var imgsrc = n.src;
		if(imgsrc.indexOf("jpg") <= 0){
			extension=".gif";
		}
		else{
			extension=".jpg";
		}
	
		if(imgsrc.indexOf("-on") <= 0){
			n.src=imgsrc.substring(0,imgsrc.length-4) +"-on"+extension;
		}
		else{
			n.src=imgsrc.substring(0,imgsrc.length-7) +extension;
		}
}

function SubNvCtrl(BlkNum,ConNum) {
	if(BlkNum != '') {
		document.getElementById(BlkNum).style.display = "block";
		}
	if(ConNum != '') {
		document.getElementById(ConNum).className = document.getElementById(ConNum).className + ' on';
	}
}

function BtmNvCtrl(ConNum) {
	document.getElementById(ConNum).className = document.getElementById(ConNum).className + ' off';
}