if (document.images)
{
  bg_site= new Image(10,690);
  bg_site.src="/images/design/bg_site.png";  
  
  bg_page= new Image(970,1);
  bg_page.src="/images/design/bg_page.png";  
 
  bg_top= new Image(970,690);
  bg_top.src="/images/design/bg_top.png"; 
  
  bg_logo = new Image(210,88);
  bg_logo.src="/images/design/logo.png"; 

}