if (document.images) { 
 
            // first initialize the images 

            imgdefault = new Image(375,260); 
            img1 = new Image(375,260); 
            img2 = new Image(375,260); 
            img3 = new Image(375,260); 
            img4 = new Image(375,260); 
            img5 = new Image(375,260); 
            img6 = new Image(375,260); 
            img7 = new Image(375,260); 
            img8 = new Image(375,260); 
            img9 = new Image(375,260); 
            img10 = new Image(375,260); 
            img11 = new Image(375,260); 
            img12 = new Image(375,260); 
            img13 = new Image(375,260); 
            img14 = new Image(375,260); 
            img15 = new Image(375,260); 
            img16 = new Image(375,260); 
            img17 = new Image(375,260); 


            // then assign the graphics to them 

            imgdefault.src = "images/sitemap-lg_01.jpg"; 
            img1.src = "images/sitemap-lg_01.jpg"; 
            img2.src = "images/sitemap-lg_02.jpg"; 
            img3.src = "images/sitemap-lg_03.jpg"; 
            img4.src = "images/sitemap-lg_04.jpg"; 
            img5.src = "images/sitemap-lg_05.jpg"; 
            img6.src = "images/sitemap-lg_06.jpg"; 
            img7.src = "images/sitemap-lg_07.jpg"; 
            img8.src = "images/sitemap-lg_08.jpg"; 
            img9.src = "images/sitemap-lg_09.jpg";
            img10.src = "images/sitemap-lg_10.jpg"; 
            img11.src = "images/sitemap-lg_11.jpg"; 
            img12.src = "images/sitemap-lg_12.jpg"; 
            img13.src = "images/sitemap-lg_13.jpg";
            img14.src = "images/sitemap-lg_14.jpg"; 
            img15.src = "images/sitemap-lg_15.jpg"; 
            img16.src = "images/sitemap-lg_16.jpg"; 
            img17.src = "images/sitemap-lg_17.jpg"; 

    } 

    // now build the functions 

    function freshOut() { 
            if (document.images) { 
                document['screen'].src = eval("imgdefault.src"); 
            } 
    } 

    function freshOver(imgName) { 
            if (document.images) { 
                document['screen'].src = eval(imgName + ".src"); 
            } 
    }