document.ns = navigator.appName == "Microsoft Internet Explorer"
function doCouplet(){
 if((document.body.offsetWidth>800) && document.ns){ 
 couplet_left.style.visibility='visible';
 couplet_right.style.visibility='visible';   
   couplet_left.style.top=100;
   couplet_left.style.left=5;
   couplet_right.style.top=100;
   couplet_right.style.right=5;
 }
}