function ligne() {
function OffsetL(Obj) {
	if (Obj.offsetParent) {return (Obj.offsetLeft + OffsetL(Obj.offsetParent));}
	else {return (Obj.offsetLeft);}
}
var curleft = OffsetL(document.getElementById('logo'));
var c = curleft + 106 + "px";
document.body.style.backgroundImage='url(http://www.marcosvb.com/common/backgrounds/ligne.jpg)';
document.body.style.backgroundRepeat='repeat-y'; 
document.body.style.backgroundPosition= c + ' 0 ';
}

var a = screen.height;

function antiN() {
if (a <= 600) {
document.getElementById('conteneur').style.marginTop = '0px'; 
document.getElementById('conteneur').style.top = '0'; 
ligne();
}
}