Limit input field number to two decimals dinamicaly
===

I need a JS ( jQuery ) script, that helps me limit the input of numbers to two decimal points.

I have tried [this][1] and it works perfect limiting my input only to floats or integers. But I can't understand how to make it limit to two decimal points.

I also looked at lot's of other answers here, but none seem to stop the user from inputing more then two digits while typing.

Any suggestions? Thanx.

*EDIT: My code, if it helps*

The form:

	<form method="post" id="split_form" action="?name=ajax&case=split_action&sid=' . $id . '" onSubmit="return checkform(this);" >
		<table class="default" cellpadding="0" cellspacing="0">
	 	  <tr><td><input class="numeric1" type="text" name="summ_1" value="" />
	 	  <tr><td><input class="numeric2" type="text" name="summ_2" value="" />
		</table>
		<input type="submit" class="submit" value="ok" />
	</form>
	
JS scripts:

	<script type="text/javascript" src="/js/jquery.numeric.js"></script>
	<script language="JavaScript" type="text/javascript">
		$(".numeric1").numeric();
		$(".numeric2").numeric();

		function checkform ( form ) {
			var sum1 = form.summ_1.value;
			var sum2 = form.summ_2.value;
			var new_summ = parseFloat(sum1) + parseFloat(sum2);
			var summ = parseFloat(' . $row[1]['summ'] . ');

			if ( ( sum1 > 0 && sum2 > 0 ) && ( new_summ == summ ) ) {
				return true;
			} else {
				return false ;
			}	
		}
	</script>




  [1]: http://www.texotela.co.uk/code/jquery/numeric/