if (document.images) {
       menu1a = new Image;
       menu2a = new Image;
       menu3a = new Image;
       menu4a = new Image;
       menu5a = new Image;
       menu1b = new Image;
       menu2b = new Image;
       menu3b = new Image;
       menu4b = new Image; 
       menu5b = new Image; 

       menu1a.src = "images/btn-home1.gif";
       menu2a.src = "images/btn-about1.gif";
       menu3a.src = "images/btn-services1.gif";
       menu4a.src = "images/btn-testimonials1.gif";
       menu5a.src = "images/btn-contact1.gif";
       menu1b.src = "images/btn-home2.gif";
       menu2b.src = "images/btn-about2.gif";
       menu3b.src = "images/btn-services2.gif";
       menu4b.src = "images/btn-testimonials2.gif";
       menu5b.src = "images/btn-contact2.gif";
    }
    else {
       menu1a = "";
       menu2a = "";
       menu3a = "";
       menu4a = "";
       menu5a = "";
       menu1b = "";
       menu2b = "";
       menu3b = "";
       menu4b = "";
       menu5b = "";
       menu1.document = "";
       menu2.document = "";
       menu3.document = "";
       menu4.document = "";
       menu5.document = "";
    }