function hover(el){
	var ar_img = el.getElementsByTagName('img');
		var matchT = new RegExp(".gif", "ig");
		ar_img[0].src = ar_img[0].src.replace(matchT, "-hover.gif");	
}
function out(el){
	var ar_img = el.getElementsByTagName('img');
	var matchT = new RegExp("-hover.gif", "ig");
	ar_img[0].src = ar_img[0].src.replace(matchT, ".gif");		
}