if (document.images) 
{
image1 = new Image
image2 = new Image
image3 = new Image
image4 = new Image
image1.src = "./media/ibw1.gif"
image2.src = "./media/ibw2.gif" 
image3.src = "./media/isw1.gif"
image4.src = "./media/isw2.gif" 
}