document.ns = navigator.appName == "Microsoft Internet Explorer"
function doCouplet(){
	if((document.body.offsetWidth>800) && document.ns){	
	couplet_left.style.visibility='visible';
	couplet_left1.style.visibility='visible';
	couplet_right.style.visibility='visible';
	couplet_right1.style.visibility='visible';	  
	  couplet_left.style.top=60;
	  couplet_left.style.left=5;
	  
	  couplet_left1.style.top=320;
	  couplet_left1.style.left=5;
	  
	  couplet_right.style.top=60;
	  couplet_right.style.right=5;
	  
	  couplet_right1.style.top=320;
	  couplet_right1.style.right=5;
	}else{
	couplet_left.style.visibility='visible';
	couplet_right.style.visibility='visible';
	couplet_left1.style.visibility='visible';
	couplet_right1.style.visibility='visible';}
}