function swapImg(obj, activate){
	if (!obj.active){
		obj.src = obj.src.replace(((activate)?(/_Off/g):(/_On/g)), ((activate)?'_On':'_Off'));
	}
}
function setActiveImg(imgName){
	var objImg = (document.getElementById)? document.getElementById(imgName) : document.images[imgName];
	swapImg(objImg, true)
	objImg.active = true;
}