Setting the width of the page according to browser's width

[smoooth0]

Hey,

 

I have webpages that looked very good in resolution of width 1280 and higher, but then when i tried it with resolution 1024 it looked realy bad with horizontal scroll bar.

So i removed the advertisments on the sides of the page to make it look good with lower resolution.

 

What i want to do now is like that:

1-If page width >= 1280 then to show the ads on the sides

2-If page width < 1280 then to hide the ads on the sides

 

How can i do such thing?

 

Here is an example outputs:

Page 1-With no ads

http://www.carsandpixels.com/index.php?pa=1

 

Page 2-With ads

http://www.carsandpixels.com/index.php?pa=14

 

And i want to be:

-Page 1 to be with ads if width >=1280

-Page 2 to be without ads if width < 1280

 

Thanks in advance.

 

[veridicus]

Very few people browse the web at 1280 or higher width.  I suggest designing the page for 1024 width at most.

[smoooth0]

That is the porpuse of my question

To design it for browsers with width less than 1280 (which is usually 1024 or 800).

But if possible, to show ads for browsers with large width and get some extra cents