You cannot force a page to be a certain size.
The only way to resize a page is to control the window in which it appears, which you already know how to do "when a user pushed a button", meaning, using the window.open() method, I presume.
When you redirect, you aren't creating a new window. You lose control over the window. The new page owns it, so that page will need to contain its own resize code.
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Made Her Cry
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since Dec 2004