Form Field Validation(integer values)

Hi

How Can I do the form field validation for integer values.

I wrote the code like this but is not working for me Please can u guide me in my code or How can do it another way

Thanks in advance Mike

<form action=”index.cfm” method=”post” name=”trackAddForm”>
<input type=”hidden” name=”TrackCap_integer” value=”Track Cap is a Integer value”>

<input type=”text” name=”TrackCap” value=”#attributes.TrackCap#” size=”4″ maxlength=”4″>

<input type=”submit” name=”addUpdate” value=”Add” >
<input type=”button” name=”cancel” value=”Cancel” onClick=”javascript:history.back();”>

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