Content Locker - PHP

[gae89]

Hello,

I need of a code for locker a content exactly like in the image:

I need of a simply Java Alert Box but I can't do it using the code alert('').
Somebody can help me?

 

[LeetHost]

Create a div with the same style using CSS.then use jQuery bpopup to make it pop up like that.

Let me know if you need anymore help