function showId(baliseId){
	if (document.getElementById && document.getElementById(baliseId) != null){
//		document.getElementById(baliseId).style.visibility='visible';
		document.getElementById(baliseId).style.display='block';
//		document.getElementById(baliseId).style.z-index='200';
	}
}

function hideId(baliseId){
	if (document.getElementById && document.getElementById(baliseId) != null){
//		document.getElementById(baliseId).style.visibility='hidden';
		document.getElementById(baliseId).style.display='none';
	}
}
function showMenu(id,objet){
	showId(id);
}	
function hideMenu(id,objet){
	hideId(id);
}
var offsetMenu=0;
function onScroll(){
	var menu=document.getElementById("menu");
	if(offsetMenu==0){
		offsetMenu=menu.offsetTop;
	}
	var scrollTop;
	if (typeof(window.pageYOffset) == 'number' ) {
		//Netscape compliant
		scrollTop = window.pageYOffset;
	} else if (document.body && (document.body.scrollLeft || document.body.scrollTop)) {
		//DOM compliant
		scrollTop = document.body.scrollTop;
	} else if (document.documentElement && (document.documentElement.scrollLeft || document.documentElement.scrollTop)) {
		//IE6 standards compliant mode
		scrollTop = document.documentElement.scrollTop;
	}
	if ( navigator.appName !=  'Microsoft Internet Explorer') {
	

		if(scrollTop>offsetMenu){
			if(menu.style.position!="fixed"){
				menu.style.position="fixed";
				menu.style.top="-10px";
			}
		}else {
			if(menu.style.position=="fixed"){
				menu.style.position="relative";
			}
		}
	}else{// IE Toujours un cas à part ....
		if(menu.style.position!="fixed"){
			menu.style.position="fixed";
			window.onresize=placeLeftIE;
			placeLeftIE();
			menu.style.marginLeft=0;
		}

		if(scrollTop>=offsetMenu){
			menu.style.top="-10px";
		}else{
			if(scrollTop>0)
				menu.style.top=offsetMenu-scrollTop;
			else
				menu.style.top=offsetMenu;
		}
	}
}
window.onscroll= onScroll;   
function placeLeftIE(){
		var menu=document.getElementById("menu").style;
	menu.left=document.body.offsetWidth/2-300;

}