function rewidth() { //v3.0
  var w=document.body.clientWidth;
  //window.resizable;
  //if (w<1100) window.resizeTo(1100,800); //IE8 不适用
  if(w>1003)
  {
	  document.getElementById('full_width').style.width="100%";
	  //alert(w);
      box_w=Math.floor((w-1000)/2); 
      document.getElementById('left_bg').style.width=box_w+'px';
      document.getElementById('right_bg').style.width=box_w-3+'px'; // ie6 ie7 -3
  }
  else 
  {
      
	  document.getElementById('full_width').style.width='1000';
	  document.getElementById('left_bg').style.width='0px';
      document.getElementById('right_bg').style.width='0px';
 
  }

}
function alert_m() { //v3.0
  var w=document.body.clientWidth;  
  if(w<1003)
  {
	  alert("请使用1024x768以上分辨率进行浏览. Minimum resolution:1024 x 768");
	 
  }

}