Need A Guru, would like to lock a div function with a 4 digit password. How?

Need A Guru, would like to lock a div function with a 4 digit password. How?

I created an app using phonegap and  right now I have an icon <div class="spec-docs"></div> that has an openURL function that brings up a spec sheet on iOS inApp browser.  I would like for someone to click on that spec sheet icon and jQuery bring up a password dialog box first, then after they enter the password, it opens the URL. After that any other div with a class spec-docs automatically open if they have already entered the password.

Anyone have any suggestions?