Control The Screen Resolution In Webpage?

I am trying to create a page where it will look the same if the screen is resolution 1024 x 768 or if the screen is resolution 800 x 600.

The below finds the resolution but the page looks different depending on the resolution. how I can make a web page look the same no matter what the resolution?

<script>
if ((screen.width>=1024) && (screen.height>=768))
{
divWidth = 1024;
divHeight = 768 ;

[Code]....

In my above example the page width scrolling changes depending on resolution. I want it to be the same if either resolution is used.