If I have the following code, how do I make SpecialInvitationAmount so that it is read only and cannot be changed by the form user?
<td width="64%"><input type="checkbox" name="SpecialInvitation" value="1" onclick="SpecialInvitationAmount.value=149.50">Special
Invitation Offer $149.50 (valid until November 30, 2001)</td>
<td width="12%">
<p align="center"> </td>
<td width="12%" align="center"></td>
<td width="12%" align="center"><input type="text" name="SpecialInvitationAmount" size="8"></td>
<td width="64%"><input type="checkbox" name="SpecialInvitation" value="1" onclick="SpecialInvitationAmount.value=149.50">Special
Invitation Offer $149.50 (valid until November 30, 2001)</td>
<td width="12%">
<p align="center"> </td>
<td width="12%" align="center"></td>
<td width="12%" align="center"><input type="text" name="SpecialInvitationAmount" size="8"></td>