insert to database table from drop down

Hi
im really stuck on this
my form uses 2 drop downs and an input field (date) to insert a value into a table on the database, the 2 dropdowns values are from 2 other tables, so my query is not working i think.
I can insert into the database a date but it does not take the drop down values. I must be close as it almost works!!


if(isset($select)&&$select!=""){
$select=$_POST['select'];
}
//form bits....then

select name="select">
<option value="">--- Select LastName---</option>
<?

$list=mysql_query("select * from customer order by customerId asc");

// Show records by while loop.
while($row_list=mysql_fetch_assoc($list)){
?>
<option value="<? echo $row_list['customerId']; ?>" <? if($row_list['customerId']==$select){ echo "selected"; } ?>><? echo $row_list['lastName']; ?></option>
<?

}
?>
</select>

//then there is another select like the first... a normal submit

<input type="submit" name="Submit" value="Select" />
//and the query

$result = "INSERT into loan (customerId, videoID, date)
VALUES('$row_list[customerId]','$row_list[videoId]','$_GET[date]')";

//followed by
$result = mysql_query("SELECT customerId, videoId, date FROM loan where customer.lastName='$select' && video.title='$select' ");
//to try and get it displaying - but from different tables-EEK! complicated!!

so does anyone know why its only inserting the date and not the other values, is it my query that needs work or something else?

try this:

if(isset($_POST))
{
if(isset($select)&&$select!="")
{
$select=$_POST['select'];
}
}