Loading bar in PHP
<p>I have been doing Google search for the past two days and couldn't find what I want.</p>

<p>I have SMSmobile tool being developed in PHP which allow client to send Bulk SMS, when the my clients press <code>Send</code> button the browser will keep loading until the SMS been sent to all of his contacts (it might be 100000 contacts or more) so it will take from 2-5 minutes. In the mean while if the client press browser <code>Refresh</code>button or any other button from the same page it will destroy the sending process.</p>

<p>I need to display a pop-up progress bar that prevent the user from doing any action until the <code>Sending</code> process is over.</p>

<p>Any suggestions please?</p>
