if (document.images) 
{
   img1 = new Image();
   img2 = new Image();
   img3 = new Image();
   img4 = new Image();
   img5 = new Image();
   img6 = new Image();
   img7 = new Image();
   img8 = new Image();
   img9 = new Image();
   img10 = new Image();
   img11 = new Image();
   img12 = new Image();
   img13 = new Image();
   img14 = new Image();
   img15 = new Image();
   img16 = new Image();
   img17 = new Image();
   img18 = new Image();
   img19 = new Image();
   img20 = new Image();
   img21 = new Image();
   img51 = new Image();   
   img1.src = "images/btn-browse-roll.gif";
   img2.src = "images/btn-close-roll.gif";
   img3.src = "images/btn-go-roll.gif";
   img4.src = "images/btn-go-wide-roll.gif";
   img5.src = "images/btn-login-roll.gif";
   img6.src = "images/btn-map-roll.gif";
   img7.src = "images/btn-name-roll.gif";
   img8.src = "images/btn-next-roll.gif";
   img9.src = "images/btn-previous-roll.gif";
   img10.src = "images/btn-read-bio-roll.gif";
   img11.src = "images/btn-read-more-roll.gif";
   img12.src = "images/btn-read-more-wide-roll.gif";
   img13.src = "images/btn-reset-roll.gif";
   img14.src = "images/btn-search-roll.gif";
   img15.src = "images/btn-signin-roll.gif";
   img16.src = "images/btn-specialty-roll.gif";
   img17.src = "images/btn-submit-roll.gif";
   img18.src = "images/btn-name-on.gif";
   img19.src = "images/btn-specialty-on.gif";
   img20.src = "images/btn-sub-nav-on.gif";
   img21.src = "images/clear.gif";
   img51.src = "images/btn-back-roll.gif";
}