1. i have a self submitting form using POST <form action="<?php echo $_SERVER["PHP_SELF"]; ?>" method="POST" id="test2" name="registrationform"> i am not using any javascript assuming javascript is turned off in a users browser. i have a feature where in a user can click on an image to find out if a username is available or not. using javascript i am able to capture the value entered, pass the value entered by the user and open a new window and display a message with a php file if the username is available or not however since i am not using javascript i used the following code to call the same php file which checks for the user name, <a href="checkusername.php?usernameis="<?php echo($username); ?> target="_blank"> <img src="image.jpg"> </a> however i am not able to pass the value of the username entered in the textfield by the user. code in checkusername.php is $username = $_GET["usernameis"]; and the remaining code to connect to database and display a message. how can i pass the value entered in the textfield to checkusername.php when the image is clicked. also is there a way to define the width and height of the new window that opens. textfield is defined as follows = <input name="username" type="text" value="<?php echo($username) ; ?>" /> 2. i need to validate a password which can consist of both letters and numbers and should be between 5 to 10 characters only. how can i rewrite the following preg_match to specify the condition of 5 to 10 characters only as presently it is not working as i seem to be missing something in the syntax. if($password == "" || !preg_match('/^[a-zA-Z0-9]{\(5)$|^\(10)}+$/', $password) ) please advice. thanks.