in asp.net how can I dynamically hide one field based off anothers value?
<p>I have 4 asp:Textbox fields on a form.  IDs being A1, A2 and B1, B2 for simplicity.
If any one of the As or Bs is populated, I need to hide the other one.  So I enter something in A1, hide A2, enter something in B2, hide B1.</p>

<p>I thought I could use a javascript OnBlur event to do this but it doesn't do anything unfortunately.  I'm trying to get the fields to appear/disappear without having to do a postback.</p>

<p>Any suggestions or examples would be great.</p>

<p>thanks,
Q</p>
