problem with require_once

Good day to all... I would like to ask for some help.. I have a form created in javascript codes. The page is a pop up window. I am passing the values of the form using the method "post". The PHP file that handles the form displays the values from that and had the following code in the beginning: <?php require_once('myclass.php'); //this class contains all functions for me to connect on the database ----------------rest of the code for displaying and saving values to an existing databse---------------------- ?> when i clicked the submit button, nothing happens and the page wouldl just refresh... but when i removed the require_once code of my PHP, the values from the form is displayed but of course, will not be saved since the class isnt there..... can anyone help me....