OK everyone, I got it working! but everytime I try to submit, it says i'm missing a required field.
Code in submit.php:
<?php
if ( (!empty($location)) && (!empty($Description)) && (!empty($Make)) && (!empty($Model)) && (!empty($Year)) && (!empty($Color)) && (!empty($price))&& (!empty($InventoryType)) && (!empty($Serial)) && (!empty($name)) )
{
echo "The product has been submitted ok.";
}
else
{
echo "You have left a text box blank, please go back and fill it in.";
}
?>
Also, Here's everything in the form:
http://pastebin.com/287113