checkall = function(identifier) {
 identifier = $(identifier);
if(!identifier) return;
 // get checkboxes
 cbs = identifier.getElementsByClassName('zcb');
 for(i=0; i < cbs.length ;i++) {
  cbs[i].checked = true;
 }
}

downloadLics = function(identifier) {
 identifier = $(identifier);
if(!identifier) return;
 // get fields
 lics = identifier.getElementsByClassName('lic');
 // get checkboxes
 cbs = identifier.getElementsByClassName('zcb');
 for(i=0;i<lics.length;i++) {
// we need to pass the value, not the input field ;)
//  GetLicenseFromURL(lics[i]);
   // check if license shall be served
   if(cbs[i].checked) {
     // try to serve the license, maybe later items do work again...
     try {
//       GetLicenseFromURL(lics[i].value);
     //alert(lics[i].value + ' ' + i);
     } catch (error) {
       // what shall we do on error? alert?
       alert(error);
     }
   }
 }
 return true;
}

checkSelected = function(identifier) {
 identifier = $(identifier);
if(!identifier) return;
 // get checkboxes
 cbs = identifier.getElementsByClassName('zcb');
 for(i=0;i < cbs.length ;i++) {
   if(cbs[i].checked) {
      // we have something checked
      return true
   }
 }
 // not a single checkbox checked
 return false;
}