var img_a = new Array ("http://redesign.stainedglassdesigns.net/shop/images/banner1.jpg", "http://redesign.stainedglassdesigns.net/shop/images/banner2.jpg", "http://redesign.stainedglassdesigns.net/shop/images/banner3.jpg", "http://redesign.stainedglassdesigns.net/shop/images/banner4.jpg");
var a = Math.round(3*Math.random());