title: Detect screen width for multiple monitors
body: <p>My website is optimized (with fixed width) for 1024x768 layout. I plan to add vertical banners on either side of the page for people having resolution width 1280 or higher.</p>
  
  <p>Using screen.width, I can easily do this. But I face a problem when trying it on machines with multiple monitors.</p>
  
  <p><strong>Lets assume the below mentioned scenario:</strong><br/> 
  Monitor 1 (primary display) - Resolution is 1024 x 768<br/> 
  Monitor 2 (secondary display) - Resolution is 1440 x 900</p>
  
  <p>screen.width always shows width as 1024 irrespective of the monitor I browse the page on. The values are reversed if I change the primary monitor to Monitor 2.</p>
  
  <p>This is a big problem especially for people having 1024x768 resolution as primary resolution. This means that I could potentially loose banner impressions in such scenarios.</p>
  
  <p>I would really appreciate any help on this.</p>