var MSIE=navigator.userAgent.indexOf("MSIE");
var OPER=navigator.userAgent.indexOf("Opera");
var imgheight33
window.screen.width>800 ? imgheight33=550:imgheight33=550
function adshowCouplet(){
	if((document.body.offsetWidth>800) && MSIE!=-1 && OPER==-1 && ifCouplet){	
	couplet_left.style.visibility='visible';
	couplet_right.style.visibility='visible';	  
	  couplet_left.style.top=document.body.scrollTop+document.body.offsetHeight-imgheight33;
	  couplet_left.style.left=5;
	  couplet_right.style.top=document.body.scrollTop+document.body.offsetHeight-imgheight33;
	  couplet_right.style.right=5;
	}else{
		couplet_left.style.visibility='hidden';
		couplet_right.style.visibility='hidden';
	}
	setTimeout("adshowCouplet();",50)
}