sorry i can't provide a nice little package of code for you...your question is kind of vague, but this stuff might help:
http://www.php.net/tut.php - a tutorial on php basics
http://www.php.net/manual/en/function.header.php - an explanation of the header() function.
basically, you will want your form's submit button to have another .php script as its action. this other php script will check to see which combination of variables was chosen by some sort of if/then loop...for example:
<?php
if ($submit = 'value1' && 'value2') {
header('www.url1.com');
}elseif ($submit = 'value1' && 'value3'){
header('www.url2.com');
}elseif ($submit = 'value2' && 'value3'){
header('www.url3.com');
}
?>
the syntax on the above code will most likely not work, but you can see the logic behind it...all the other research is time you'll need to spend yourself.
Hope this is enough of a kick-start for ya!
-dolphinsnot
