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This shows how to disable an input button after it has been clicked once..
uncomment the submit line to get the form to submit!

<!---Head--->
<script language="javascript"> 
function disableClick(the_form){ 
the_form.oneclick.disabled=true; 
//the_form.submit(); 
} 
</script>


<!---Body--->

<form name="clickonce" method="post" action=""> 
<input type="button" name="oneclick" value="Submit" onclick="disableClick(this.form)">
 </form>