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:
$savl/* no value is echo */
echo $pidd/* no value is echo */
am i doing something wrong