>Could you give me an example of what code I should place in there? Or What function should I use?

Take a look at the Javascript number object. It should have a format method or something similar.

>
>>>I have to do it in the script is fine, I just don't know how. Any suggestions, ideas, etc?
>>>
>>Try placing the script in the onBlur method of the textbox. The script should reformat the textbox value when the textbox loses focus.