// JavaScript Document
function initHeight(){
	
	var ecranHeight;
	var globalHeight;
	var marg;
	if (navigator.appName.indexOf("Microsoft")!=-1) {
		ecranHeight=document.body.offsetHeight;
	}else{
		ecranHeight=window.innerHeight;
	}
	globalHeight=document.getElementById("global").offsetHeight;
	marg=(ecranHeight-globalHeight)/2-20;
	
	if(marg > 0) document.getElementById("global").style.marginTop=marg+"px";
}

window.onresize = function(){
	initHeight();
}