Clearing Dynamic Flash Text Fields

Hello,

What I'm Attempting To Do::

I'm trying to make textfield1_txt & textfield2_txt Clear, once the submit button is released.

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A description of my Flash File is as follows:

I have 2 text fields on my Flash stage:
- textfield1_txt
- textfield2_txt

I also have a movie clip that Im using for the submit button:
- submit_mc


Please note that currently, once the submit_mc is released, my ActionScript has a function which checks to ensure that some type of data is present in the boxes, and the the form submits. If there are any errors, currently an error message displays:

Please enter information in textfield1_txt
Please enter information in textfield2_txt

Can someone please point me in the right direction for clearing the text fields on release of the submit_mc?

Thanks!