function preload(){
         if (document.images) {
                 img1 = new Image(); img1.src = "images/home.gif";
                 img2 = new Image(); img2.src = "images/home_alt.gif";
                 img3 = new Image(); img3.src = "images/about.gif";
                 img4 = new Image(); img4.src = "images/about_alt.gif";
                 img5 = new Image(); img5.src = "images/services.gif";
                 img6 = new Image(); img6.src = "images/services_alt.gif";
                 img7 = new Image(); img7.src = "images/clients.gif";
                 img8 = new Image(); img8.src = "images/clients_alt.gif";
                 img9 = new Image(); img9.src = "images/samples.gif";
                 img10 = new Image(); img10.src = "images/samples_alt.gif";
                 return(flag=true);
         }
}


function flipover(a,b){
         //alert(flag);
         if (document.images && (flag == true)) {
                 a='img' + a;
                 b='img' +b;
                 //alert (a + ':' +b);
                 document[a].src = eval(b + ".src");
         }
}

function flipout(a){
         //alert(flag);
         if(document.images){
                  a='img' + a;
                  document[a].src = eval(a + ".src");
         }         

}