function swapImg(id){
	var cSrc = id.src;
	if (cSrc.indexOf("_off") > 0){cSrc = cSrc.replace("_off","_on");}
	else if (cSrc.indexOf("_on") > 0){cSrc = cSrc.replace("_on","_off");}
	id.src = cSrc;
}