function openEPW_test(){
 var voc=window.open("voc_train/voc_index.php?testuser=1","voc","status=no,scrollbars=yes,location=no,menubar=no,resizable=yes, toolbar=no, width=900, height=680");
 voc.focus();
} 
function openEPW(){
 var voc=window.open("voc_train/voc_index.php","voc","status=no,scrollbars=yes,location=no,menubar=no,resizable=yes, toolbar=no, width=900, height=680");
 voc.focus();
}