if (document.images) {
img1 = new Image();
img2 = new Image();
img3 = new Image();
img4 = new Image();
img5 = new Image();
img6 = new Image();

img1.src="images/side-box-head.gif";
img2.src="images/side-box-body.gif";
img3.src="images/side-box-foot.gif";
img4.src="images/content-box-head.gif";
img5.src="images/content-box-body.gif";
img6.src="images/content-box-foot.gif";
}