if(document.images){
var img = new Array();
	img[0] = new Image(); img[0].src = "img/concept.jpg";
	img[1] = new Image(); img[1].src = "img/concept_on.jpg";
	img[2] = new Image(); img[2].src = "img/webmarket.jpg";
	img[3] = new Image(); img[3].src = "img/webmarket_on.jpg";
}