if(document.images) {
	  pics = new Array();
	  pics[1] = new Image();
	  pics[1].src = "images/facebook.png";
	  pics[2] = new Image();
	  pics[2].src = "images/facebook_o.png";
	}

	function changer(from,to) {
	  if(document.images) {
	    document.images[from].src = pics[to].src;
	  }
	}