// POP-UP WINDOW NO SCROLLBARS
function centerPop(URLtoOpen, windowName, wwidth, wheight){
 var leftPos = 0
  if (screen) {
   leftPos = ((screen.width - wwidth)/2)
  }
  var topPos = 0
  if (screen) {
   topPos = ((screen.height - wheight)/2)
  }
  newWindow=window.open(URLtoOpen,windowName,'width='+wwidth+',height='+wheight+',left='+leftPos+',top='+topPos+',scrollbars=no,noresize');
}

function isNumberKey(evt){
 var charCode = (evt.which) ? evt.which : event.keyCode
 if (charCode > 31 && (charCode < 48 || charCode > 57)){
  return false;
 } else {
  return true;
 }
}