// JavaScript Document

function check_upload(source, ErrText, dest){
  regex = /(jpg|jpeg|JPG|JPEG|gif|GIF|pdf|PDF|png|PNG|zip|ZIP)$/;
  result = regex.test(source.value);
  if (result == 0) {
    source.value = '';
    dest.value = '*.jpg; *.gif; *.png; *.pdf; *.zip';
    alert(ErrText);
  } else {
    dest.value = source.value;
  }
}