trim function

Hi. I would like to use the Trim Function in a text box on my Add page when I insert something into our database. I just want to make sure that when users type a part number into this text box, they don't accidentally type in a space before or after the part number. Here's what my text box looks like:

<input type="text" name="Part_Number" id="Part_Number" maxlength="25" size="27" disabled="disabled">

I know how to use the Trim Function on an edit page, but not on an add page. Here's how I use it on an Edit page:

<input type="text" name="Part_Number" value="#Trim(Part_Number)#" maxlength="25" size="27">

This works because I have a value in the Part_Number field already, but how do I use this when I don't have a value entered into the database yet? Thanks for your help.

Andy