var MSIE=navigator.userAgent.indexOf("MSIE");

var OPER=navigator.userAgent.indexOf("Opera");

function doCouplet(){

if((document.body.offsetWidth>800) && MSIE!=-1 && OPER==-1){	

couplet_left.style.visibility='visible';
couplet_left.style.top=150;
couplet_left.style.left=4;
couplet_right.style.visibility='visible';
couplet_right.style.top=150;
couplet_right.style.right=4;
}
}