hi all

How can i get value from checkbox and echo that value

i have this below checkbox code for all my products in the row
PHP Code:
<?
echo  "<input name='availability[]' type='checkbox' onclick='this.form.submit();' 

value='savl=Store&pidd=310' id='availability[]' />Store"

?>
Onclick the form gets submit but i dont get its value;

PHP Code:
<?
if(isset($_REQUEST['availability']))
{
    
$savl=$_REQUEST['savl'];
    
$pidd=$_REQUEST['pidd'];
    
    echo 
$savl/* no value is echo */
    
echo $pidd/* no value is echo */
}    
?>
am i doing something wrong

vineet