Try passing fields by arrays with indexs or keys.
There is some code here:
http://www.webmasterworld.com/forum88/1204.htm
<input type="text" name="user[firstname]" value="Graham">
<input type="text" name="user[lastname]" value="Stewart">
<input type="text" name="user[gender]" value="M">
The submit page will now have access to the array as $POST['user'] (or $GET['user'] if you use a GET method on the form).
And of course you can do multi-dimensional arrays like this too..
<input type="text" name="product[1][name]" value="Widget">
<input type="text" name="product[2][name]" value="Grommit">
I know there is a page on the PHP site for this feature, but I cant find it atm.