The extension use Ajax to send the form data to the server to be validated and use Ajax to lock the form controls you have in the page to prevent a multiple form submit during the Validation process like when the user click many times the submit button.The Ajax server validation don't submit the page to send the form data to the server so the page is not refresh and the user don't see a white page during the validate process.This Server Behavior let's you create a professional server side form validation for your HTML pages and is created for people don't have any programming experiences.With this behavior You don't need write any code and you can create your form validation quickly and easy.The validation Server Side remove all the incompatibility problem between the various browser type and version. And when you validate on the server you can be sure nobody will be able to by-pass your validation setup and you will never find problem with customers with JavaScript disabled