function centrer()
	{ var myWidth = 0, myHeight = 0;
		if( typeof( window.innerWidth ) == 'number' ) {
		 //Non-IE
		 myWidth = window.innerWidth; myHeight = window.innerHeight;
		} else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
		 //IE 6+ in 'standards compliant mode'
		 myWidth = document.documentElement.clientWidth;
		 myHeight = document.documentElement.clientHeight+2;  // correctif pour ie
		} else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
		 //IE 4 compatible
		 myWidth = document.body.clientWidth;
		 myHeight = document.body.clientHeight+2;  // correctif pour ie
		}
		var el = document.getElementById("menu");
		el.obj = document.getElementById("menu");
		el.style.top	= (myHeight - 36)+'px';
		el.style.marginTop	= 0;
		el.style.width	= (myWidth)+'px';	
}
window.onload = centrer;
window.onresize = centrer;