radio buttons selected after error occurs

[maciek4]

I have a survey and one of the questions has radio buttons in it. If I dont fill in all the required fields an error message occurs and the last radio button is selected. So if someone selects lets say A and submits but an error message occurs then the button selected switches to E. I would like it to remain the same as it was selected.

Here is the code:

<INPUT TYPE="radio" NAME="progress" value="A" <?echo isset($progress['A']) ? 'checked' : ''; ?>>&nbsp;A - very big<br>
<INPUT TYPE="radio" NAME="progress" value="B" <?echo isset($progress['B']) ? 'checked' : ''; ?>>&nbsp;B - big<br>
<INPUT TYPE="radio" NAME="progress" value="C" <? echo isset($progress['C']) ? 'checked' : ''; ?>>&nbsp;C - medium<br>
<INPUT TYPE="radio" NAME="progress" value="D" <? echo isset($progress['D']) ? 'checked' : ''; ?>>&nbsp;D - small<br>
<INPUT TYPE="radio" NAME="progress" value="E" <? echo isset($progress['E']) ? 'checked' : ''; ?>>&nbsp;E - very small<br>

[liquorvicar]

How are you validating your form? Javascript or php?

[maciek4]

php

the solution to this problem is:

<?php
print (isset($_POST[progress]) && $_POST[progress]=='A')  ? 'checked' : '';
?>