function frontEffectSet(i){
	var photos = $$('div#photos img');
	photos[i].src=photos[i].src.replace(/\/bw\//,'/color/');
}

function frontEffectClear(){
 $$('div#photos img').each(
 	function(e){e.src=e.src.replace(/\/color\//,'/bw/');});
}