var scwidth;
  scwidth=screen.width;
  
  if(scwidth == 800) {
 
  document.write("<img src='images/itarchs-800.jpg' width='549' height='154' >");
  
  }
  else {
  if(scwidth == 1024) {
 
  document.write("<img src='images/itarchs-1024.jpg' width='580' height='154' >");
  
  }
  else {
  
  document.write("<img src='images/it-archs.jpg' width='730' height='154' >");
  }
  			
  }