function goItem(itemno) {

  document.frontpageform.itemno.value = itemno;
  document.frontpageform.submit();

}

function preLoadMain(path) {
  var iList = new Array("header_zoeken.gif", "header_invoeren.gif", "i.gif"); 
  var img = new Array();
  for (var i = 0; i < iList.length; i++) {
    img[i] = new Image();
    img[i].src = path + iList[i];
  }
}