function init(){
	var hoverImages = $$('.hover');
	for(var i=0, n=hoverImages.length; i<n; i++){
		hoverImages[i].onmouseover=function(){
			this.src = this.src.replace("-off","-on");
		};
		hoverImages[i].onmouseout=function(){
			this.src = this.src.replace("-on","-off");
		};
	}
}