How to Prevent User for Multiple click on form Submit button ??

Hi,
Is there any easy solution rather than AJAX or any HARD Solution.
to prevent user from being submit for only once...
So database record remain consistent rather than redundant.
if any JAVASCRIPT SOLUTION IT WOULD BE BETTER ONE.
WHAT SHOULD I DO ??

Use the disabled property, set it to true and then submit the form programmatically.
<html>
<head>
<script>
function validate()
     var textfield = document.getElementById('textfield');
     var submitButton = document.getElementById('submitbutton');
     var mainForm = document.getElementById('mainform');
     if ( textfield.value.length == 0 )
          alert("Validation Failed");
          return false;
     submitButton.disabled = true;
     alert("The button has been disabled, going to submit now");
     mainform.submit();
</script>
</head>
<body>
<form id="mainform" action="#" method="GET">
<input type="text" value="" id="textfield"/>
<input type="submit" value="Try Me!" id="submitbutton" onclick="return validate();" />
</form>
</body>
</html>A reminder though, this is JavaScript and these are Java forums.

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