[php_beginner]

Hi...
I have a question on how to create and display a default form field value. The line looks like this

<tr id="one"><td><input type="radio" value="1st value" name="myradiobutton1"/>I/C
<br><input type="radio" value="2nd value" name="myradiobutton1"/>Passport
</td>
<td><br><label><input type="text" name="no_ic" value='<?php if($no_penginap)echo $no_penginap; ?>' maxlength="12"></label>
<br><br>
<label><input type="text" name="no_passport1" value='<?php echo $no_passport1; ?>' maxlength="12"></label><br/>&nbsp;<br/>
</td>
</tr>

i want to create the default value that will be displayed when we view it, but it can be written over if i want to change it. Can anyone help me?

Thanks.