if (document.images){
	preload_image_object = new Image();
	// set image url
	image_url = new Array();
	image_url[0] = "multimedia/";
	image_url[1] = "multimedia/";
	image_url[2] = "multimedia/";
	image_url[3] = "multimedia/";
	image_url[4] = "multimedia/";
	
	var i = 0;
	for(i=0; i<=4; i++){
		preload_image_object.src = image_url[i];
	}
}