if (document.images) 
{
img3 = new Image();
img1 = new Image();
img2 = new Image();
img4 = new Image();
img5 = new Image();
img6 = new Image();
img7 = new Image();
img3.src = "images/bg-index.jpg";
img1.src = "images/bg-services5.jpg";
img2.src = "images/bg-aboutus5.jpg";
img4.src = "images/bg-pharma5.jpg";
img5.src = "images/bg-thesaurus5.jpg";
img6.src = "images/bg-contact5.jpg";
img7.src = "images/bg-empty3.jpg"
}