function isEmpty(str) {
                  for (var i = 0; i < str.length; i++)
                       if (" " != str.charAt(i))
                           return false;
                  return true;
         }
                  
         function LookWin(put,ww,hh){               
               left1 = (screen.availWidth - ww)/2
               top1 = (screen.availHeight - hh)/2             
               eval("window.open(\'"+put+"\',\'_blank',\'status=yes,top="+top1+",left="+left1+",toolbar=no,scrollbars=yes,directories=no,menubar=no,resizable=yes,width="+ww+",height="+hh+"\')"); 
         }