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("footer").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 );