var NS4 = (navigator.appName == "Netscape" && parseInt(navigator.appVersion) < 5);
   
function addOption(theSel, theText, theValue) {
   var newOpt = new Option(theText, theValue);
   var selLength = theSel.length;
   theSel.options[selLength] = newOpt;
}
   
function deleteOption(theSel, theIndex) { 
   var selLength = theSel.length;
   if(selLength>0) {
      theSel.options[theIndex] = null;
   }
}
   
function moveOptions(theSelFrom, theSelTo) {
   var selLength = theSelFrom.length;
   var selectedText = new Array();
   var selectedValues = new Array();
   var selectedCount = 0;

   var i;

   // Find the selected Options in reverse order
   // and delete them from the 'from' Select.
   for(i=selLength-1; i>=0; i--) {
      if(theSelFrom.options[i].selected) {
         selectedText[selectedCount] = theSelFrom.options[i].text;
         selectedValues[selectedCount] = theSelFrom.options[i].value;
         deleteOption(theSelFrom, i);
         selectedCount++;
      }
   }
     
   // Add the selected text/values in reverse order.
   // This will add the Options to the 'to' Select
   // in the same order as they were in the 'from' Select.
   for(i=selectedCount-1; i>=0; i--) {
      addOption(theSelTo, selectedText[i], selectedValues[i]);
   }

   if(NS4)
      history.go(0);
}

function openPopup(page, width, height) {
   var left = Math.floor((screen.width - width) / 2);
   var top = Math.floor((screen.height - height) / 2);
   window.open(page, "", "width=" + width + ", height=" + height + ", top=" + top + ",left=" + left + ", status=no, menubar=no, toolbar=no, scrollbars=yes, resizable=yes");
}