//---------------------------------------------------
// navigation change Images
//---------------------------------------------------
function chg(id){
	if(!document.images) return false;
	var imgSrc = document.images[id].src;
	if(imgSrc.match(/o\.gif/)){
		document.images[id].src = imgSrc.replace("o.gif", ".gif");
	}else{
		document.images[id].src = imgSrc.replace(".gif", "o.gif");
	}
}