if (document.images) {
  nav1_on = new Image();
  nav1_on.src = "images/index_cutup/nav1_over.gif";

  nav2_on = new Image();
  nav2_on.src = "images/index_cutup/nav2_over.gif";

  nav3_on = new Image();
  nav3_on.src = "images/index_cutup/nav3_over.gif";

  nav4_on = new Image();
  nav4_on.src = "images/index_cutup/nav4_over.gif";

  nav1_off = new Image();
  nav1_off.src = "images/index_cutup/nav1_off.gif";

  nav2_off = new Image();
  nav2_off.src = "images/index_cutup/nav2_off.gif";

  nav3_off = new Image();
  nav3_off.src = "images/index_cutup/nav3_off.gif";

  nav4_off = new Image();
  nav4_off.src = "images/index_cutup/nav4_off.gif";
 
}

function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}

 // open new window
function popUpWin(URL,name) {
 popupWin = window.open(URL, name, 'width=270,height=400,resizable=no,scrollbars=yes,top=x,left=x');
 if(window.focus) {  // only where supported
  popupWin.focus();
  }
 }