Javascript provides a method "reset" which will reset all the control of the page to their default values.
<script type="text/javascript" language="javascript">
function ResetForm(){
document.all.myForm.reset();
}
</script>
Note : myForm is the Id of the form used in the page. However above code will only work for IE.
For other browsers
document.formID.reset()
Thanks,
Virendra Dugar