[Mysql / PHP Insert problem]

The variables are coming from a form - Here is a link to it:  http://www.darvex.com/alt/alternator_form.php

[Mysql / PHP Insert problem]

I have a basic form that I am collecting data with and trying to pass the variables to a PHP script that will insert the values into a database.  It seems to work except none of the data is being inserted in the database - it gets filled with blank values and not the ones from the form.  I have been pulling my hair out with this and I am sure it is something simple.  Any help would be greatly appericated.  Here is a link to the form:  http://www.darvex.com/alt/alternator_form.php  Here is the PHP script:

<?php
include("dbconnect.php");
if ($submit = "Submit")
{
$query = "insert into alternator (name,driveline,email,transmission,ac,mounting_style,make,model,year,mandate,cylinders,displacement,displacement_type,requirments,original_engine,total_output,add_req,pulley_type,grooves,location,idle)
values ('$name', '$driveline', '$email', '$transmission', '$ac', '$mounting_style', '$make', '$model', '$year', '$mandate', '$cylinders', '$displacment', '$displacement_type', '$requirments', '$original_engine', '$total_output', '$add_req', '$pulley_type', '$grooves', '$location', '$idle')"
;
mysql_query($query) or
die (mysql_error());
?> Thanks
<?php
}
else
{
include("alternator_form.php");
}
?>