document.write('<STYLE type="text/css">');
if (screen.width<=800)  {   document.write('body { background-image:url("../../images/bg800_1.jpg");  }');   }
 else if (screen.width<=1024)  {   document.write('body { background-image:url("../../images/bg1024_1.jpg");  }');   }
  else if (screen.width<=1280)  {   document.write('body { background-image:url("../../images/bg1280_1.jpg");  }');   }
    else if (screen.width<=1600)  {   document.write('body { background-image:url("../../images/bg1600_1.jpg");  }');   }
      else {   document.write('body { background-image:url("../../images/bg1680_1.jpg");  }');   }
document.write('</STYLE>');