if (document.images) {
       roll1a = new Image;
       roll1b = new Image;
       roll2a = new Image;
       roll2b = new Image;

       roll1a.src = "http://www.novaashi.com/vweb/images/isearch.gif";
       roll1b.src = "http://www.novaashi.com/vweb/images/isearch2.gif";
       roll2a.src = "http://www.novaashi.com/vweb/images/home.gif";
       roll2b.src = "http://www.novaashi.com/vweb/images/home2.gif";
    }
    else {
       roll1a = "";
       roll1b = "";
       roll1.document = "";
       roll2a = "";
       roll2b = "";
       roll2.document = "";
    }