WML - Clearing form fields in wml

I use a wml file where I can insert a text in a inputfield like:
<input type='text' name='taetigkeit2' size='25' />

This data I send to an other file.
All works fine.
But when I go back to the same file where I have this input textfield I will see the written text which I insert before.

So I look for a solution where I can clear the fields after I send the data.

Hope somebody can help me there.
Kindly regards.