if (document.images){
	preload_image_object = new Array();
	// set image url
	
	image_url = new Array();
	image_url[0] = "/images/background_gradient.png"
	image_url[1] = "/images/background.png";
	image_url[2] = "/images/logo.png";
	image_url[3] = "/images/top_left_round_corner.png";
	image_url[4] = "/images/top_shape.png";
	image_url[5] = "/images/top_right_round_corner.png";
	image_url[6] = "/images/left_shape.png";
	image_url[7] = "/images/right_shape.png";
	image_url[8] = "/images/bottom_left_round_corner.png";
	image_url[9] = "/images/bottom_shape.png";
	image_url[10] = "/images/bottom_right_round_corner.png";
	image_url[11] = "/images/map.png";
	image_url[12] = "/images/wave_car.png";
	
	var cImg = null;
	for(var i=0; i<image_url.length; i++){
		preload_image_object[i] = new Image();
		preload_image_object[i].src = image_url[i];
		cImg = $('<img style="display:none;" />').attr("src",image_url[i]);
		$('body').append(cImg);
	}
}