function colchange()
{
  window.event.srcElement.style.backgroundColor="#6DCF3F"
}

function colback()
{
 window.event.srcElement.style.backgroundColor="#03B40A"
}

function getNextElement (field) {
  var form = field.form;
  for (var e = 0; e < form.elements.length; e++)
    if (field == form.elements[e])
      break;
  return form.elements[++e % form.elements.length];
}

function tabOnEnter (field, evt) {
}

function SubmitOnEnter (field, evt) {
  var keyCode = document.layers ? evt.which : document.all ? 
evt.keyCode : evt.keyCode;
  if (keyCode != 13)
    return true;
  else {
    submitform();
    return false;
  }
}
function validate_name(instr)
{
	pattern=/^[a-zA-Z0-9_.]+$/
	if (!pattern.test(instr))
	{
	alert ("Please enter a valid username.");
	return false;
	}	
return true;
}
function submitform()
{
	if (!validate_name(loginform.login.value)) return false;
	loginform.submit();
}