function swap(img){
	cursrc = img.src;
	
	overpos = cursrc.indexOf("_h.gif");
	normpos = cursrc.indexOf("_n.gif");
	
	if (normpos != -1) {
		//replace image
		begin = cursrc.substr(0,normpos)
		newsrc = begin + "_h.gif";
		img.src = newsrc;
	}
	
	if (overpos != -1) {
		//replace image
		begin = cursrc.substr(0,overpos)
		newsrc = begin + "_n.gif";
		img.src = newsrc;
	}		
}

function setOn(id){	
	img = document.getElementById(id);
	img.style.backgroundImage = 'url(images/subnavbg_h.gif)';	
}

function setOff(id){	
	img = document.getElementById(id);
	img.style.backgroundImage = 'url(images/subnavbg_n.gif)';	
}