// Merci à Chris Heilmann de http://www.onlinetools.org/
// pour findimg() et roll(o). Thanx goes to Chris Heilmann
// from http://www.onlinetools.org/
function findimg() {
	var imgs,i;
	imgs=document.getElementsByTagName('img');
	for(i=0;i<imgs.length;i++) {
		if (/roll/.test(imgs[i].className)) {
			imgs[i].onmouseover=function(){roll(this);};
			imgs[i].onmouseout=function(){roll(this);};
		}
	}
}

function roll(o) {
	var src,ftype,newsrc;
	src=o.src;
	ftype=src.substring(src.lastIndexOf('.'), src.length);
	if(/_on/.test(src)) {
		newsrc=src.replace('_on','');
	} else {
		newsrc=src.replace(ftype, '_on'+ftype);
	}
	o.src=newsrc;
}

window.onload=function() {
	findimg();
}