jone3fingers on "geocoding & not writing to DB empty lines"

I wrote this form to make a front-end form fill in the table for the store locator plus plug-in.
I need to take the sl_address and sl_city fields and have them geocode for sl_longitude and sl_latitude.

also, the first time someone goes to the page it submits an empty line in my database table.

I am newbie, so sorry if this very simple.

<?php
/* Template Name: Add Venue */
get_header();
?>

<div id="primary">
<div id="content" role="main">

<form id="form1" name="form1" method="post" action="">
<input type="hidden" name="sl_id" id="sl_id" />
<br class="clear" />
<label for="sl_store">Venue</label><input type="text" name="sl_store" id="sl_store" />
<br class="clear" />
<label for="sl_address">Address</label><input type="text" name="sl_address" id="sl_address" />
<br class="clear" />
<input type="hidden" name="sl_address2" id="sl_address2" />
<br class="clear" />
<label for="sl_city">City, State, Zip</label><input type="text" name="sl_city" id="sl_city" />
<br class="clear" />
<input type="hidden" name="sl_state" id="sl_state" />
<br class="clear" />
<input type="hidden" name="sl_zip" id="sl_zip" />
<br class="clear" />
<label for="sl_country">Country</label><input type="text" name="sl_country" id="sl_country" />
<br class="clear" />
<input type="hidden" name="sl_latitude" id="sl_latitude" />
<br class="clear" />
<input type="hidden" name="sl_longitude" id="sl_longitude" />
<br class="clear" />
<input type="hidden" name="sl_tags" id="sl_tags" />
<br class="clear" />
<label for="sl_description">Description</label><textarea name="sl_description" id="sl_description" cols="45" rows="5"></textarea>
<br class="clear" />
<label for="sl_email">Email</label><input type="text" name="sl_email" id="sl_email" />
<br class="clear" />
<label for="sl_url">Website</label><input type="text" name="sl_url" id="sl_url" />
<br class="clear" />
<label for="sl_hours">Hours</label><textarea name="sl_hours" id="sl_hours" cols="45" rows="5"></textarea>
<br class="clear" />
<label for="sl_phone">Phone</label><input type="text" name="sl_phone" id="sl_phone" />
<br class="clear" />
<label for="sl_fax">Fax</label><input type="text" name="sl_fax" id="sl_fax" />
<br class="clear" />
<label for="sl_image">Image</label><input type="file" name="sl_image" id="sl_image" />
<br class="clear" />
<input type="hidden" name="sl_private" id="sl_private" />
<br class="clear" />
<input type="hidden" name="sl_neat_title" id="sl_neat_title" />
<br class="clear" />
<input type="hidden" name="sl_linked_postid" id="sl_linked_postid" />
<br class="clear" />
<input type="hidden" name="sl_pages_url" id="sl_pages_url" />
<br class="clear" />
<input type="hidden" name="sl_pages_on" id="sl_pages_on" />
<br class="clear" />
<input type="hidden" name="sl_option_value" id="sl_option_value" />
<br class="clear" />
<input type="hidden" name="sl_lastupdated" id="sl_lastupdated" />
<br class="clear" />
<input type="submit" name="sl_submit" id="sl_submit" value="Submit" />
<br class="clear" />
</form>

<?php //Post Params
$sl_id = $_POST['sl_id'];
$sl_store = $_POST['sl_store'];
$sl_address = $_POST['sl_address'];
$sl_address2 = $_POST['sl_address2'];
$sl_city = $_POST['sl_city'];
$sl_state = $_POST['sl_state'];
$sl_zip = $_POST['sl_zip'];
$sl_country = $_POST['sl_country'];
$sl_latitude = $_POST['sl_latitude'];
$sl_longitude = $_POST['sl_longitude'];
$sl_tags = $_POST['sl_tags'];
$sl_description = $_POST['sl_description'];
$sl_email = $_POST['sl_email'];
$sl_url = $_POST['sl_url'];
$sl_hours = $_POST['sl_hours'];
$sl_phone = $_POST['sl_phone'];
$sl_fax = $_POST['sl_fax'];
$sl_image = $_POST['sl_image'];
$sl_private = $_POST['sl_private'];
$sl_neat_title = $_POST['sl_neat_title'];
$sl_linked_postid = $_POST['sl_linked_postid'];
$sl_pages_url = $_POST['sl_pages_url'];
$sl_pages_on = $_POST['sl_pages_on'];
$sl_option_value = $_POST['sl_option_value'];
$sl_lastupdated = $_POST['sl_lastupdated'];

?>
<?php //Query

//INSERT
$query = " INSERT INTO bqk_store_locator ( sl_id, sl_store, sl_address, sl_city, sl_country, sl_description, sl_email, sl_url, sl_hours, sl_phone, sl_fax, sl_image ) VALUES ( '$sl_id', '$sl_store', '$sl_address', '$sl_city', '$sl_country', '$sl_description', '$sl_email', '$sl_url', '$sl_hours', '$sl_phone', '$sl_fax', '$sl_image' ) ";
$result = mysql_query($query);

if( $result )
{
echo 'Success';
}
else
{
echo 'Query Failed';
}

?>
</div><!-- #content -->
</div><!-- #primary -->
<?php get_footer(); ?>