function showObject(l1,l2) {
     if (document.all){
          document.all[l1].style.visibility = "visible";
          document.all[l2].style.visibility = "hidden";
     } else {
          document.getElementById(l1).style.visibility = "visible";
          document.getElementById(l2).style.visibility = "hidden";
     }
}
function showShoe(s1,s2,s3) {
     if (document.all){
          document.all[s1].style.visibility = "visible";
          document.all[s2].style.visibility = "hidden";
          document.all[s3].style.visibility = "hidden";
          document.all['zap0'].style.visibility = "hidden";
     } else {
          document.getElementById(s1).style.visibility = "visible";
          document.getElementById(s2).style.visibility = "hidden";
          document.getElementById(s3).style.visibility = "hidden";
          document.getElementById('zap0').style.visibility = "hidden";
     }
}