Newbie : Help with check boxes

Hi, I am building a form and creating a few checkboxes dynamically Now when the user clicks on submit, I need to save details. However some of these checkboxes may remain unchecked. I name these check boxes as chk1, chk2 and so on and assign them values from the db. On the Submitted page I get errors of undefined variable. How do I access only the check boxes that are checked ? Here is some psedo code for (i = 0, i < count of chk, i ++ ) { $name = "chk" + $i; if $$name is checked { echo $$name; } } I guess I dont know the exact syntax comming in the IF condition. Thats where I would need to find out if a particular chech box has been checked or not Thanks Regards -Mujahid