// Revision History
// 11/10/99 HasanT First draft



function usr_valid(theField)
{

  if (theField.value == "")
  {
    alert("Please enter the User Name.");
    theField.focus();
    return (false);
  }

  if (theField.value.length > 20)
  {
    alert("Please enter at most 20 characters in the \"User Name\" field.");
    theField.focus();
    return (false);
  }

  var checkOK = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";
  var checkStr = theField.value;
  var allValid = true;
  for (i = 0;  i < checkStr.length;  i++)
  {
    ch = checkStr.charAt(i);
    for (j = 0;  j < checkOK.length;  j++)
      if (ch == checkOK.charAt(j))
        break;
    if (j == checkOK.length)
    {
      allValid = false;
      break;
    }
  }
  if (!allValid)
  {
    alert("Please enter only letter, digit, \"-\", \"_\" or \".\" characters in the \"User Name\" field.");
    theField.focus();
    return (false);
  }
  return (true);
}