Popup window blocker issue

I am using the below script to popup a coupon window automatically. However, Chrome and other browsers are blocking the popup, as expcected. Is there a way to avoid this from being blocked by the pop-up blocker? Also, how do I center it?
[COLOR=#000000][FONT=Arial]Code:

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http://tny.cz/9cef3978[COLOR=#000000][FONT=Arial]

Thanks in advance[/FONT][/COLOR]

There is no way to change the default behaviour of browser popups unless you create a plugin for each browser that overrides the default handlers but that would be more work and time consuming. To center the window see the following link.

http://stackoverflow.com/questions/4068373/center-a-popup-window-on-screen

As popups are more or less blocked by default, what a lot of sites do today is to use a Lightbox effect, whereby you add a darker overlay to your user’s screen and centre a smaller window in the middle of that.
I could show you how to do that if you want, although you might want to consider the usability implications of this method.