if( document.documentelement )
	bodystyle = document.documentelement.style;
else if( document.body )
	bodystyle = document.body.style;

bodystyle.visibility = "hidden";

function sizecontent(){
	var windowheight = getwindowheight();
	var footerheight = document.getelementbyid("fbfooter").offsetheight;

	var contentheight = windowheight - footerheight;
	document.getelementbyid("fbcontainer").style.height = contentheight + "px";
	
	var altdiv = document.getelementbyid("altmsg");
	
	if( altdiv ){		
		var alth = altdiv.offsetheight;
		var altw = altdiv.offsetwidth;
		altdiv.style.top = (contentheight / 2 - alth /2)+ "px";
		altdiv.style.left = (getwindowwidth() / 2 - altw /2)+ "px";
	}
	
	if( bodystyle )
		bodystyle.visibility = "visible";
}

function addevent( obj, type, fn )
{
	if (obj.addeventlistener)
		obj.addeventlistener( type, fn, false );
	else if (obj.attachevent)
	{
		obj["e"+type+fn] = fn;
		obj.attachevent( "on"+type, function() { obj["e"+type+fn](); } );
	}
}

function getwindowheight() {
	var windowheight=0;
	if ( typeof( window.innerheight ) == 'number' ) {
		windowheight=window.innerheight;
	}
	else {
		if ( document.documentelement && document.documentelement.clientheight) {
			windowheight = document.documentelement.clientheight;
		}
		else {
			if (document.body&&document.body.clientheight) {
				windowheight=document.body.clientheight;
			}
		}
	}
	
	return windowheight;
};

function getwindowwidth() {
	var ww = 0;
	if (self.innerwidth)
		ww = self.innerwidth;
	else if (document.documentelement && document.documentelement.clientwidth)
		ww = document.documentelement.clientwidth;
	else if (document.body)
		ww = document.body.clientwidth;
	return ww;
}

addevent( window, "load", sizecontent);
addevent( window, "resize", sizecontent );