function getViewportSize()
{
    var viewportwidth;
    var viewportheight;
    if(typeof window.innerWidth != "undefined")
    {
	viewportwidth = window.innerWidth;
	viewportheight = window.innerHeight;
    }
    else if(typeof document.documentElement != "undefined" && typeof document.documentElement.clientWidth != "undefined" && document.documentElement.clientWidth != 0)
    {
	viewportwidth = document.documentElement.clientWidth;
	viewportheight = document.documentElement.clientHeight;
    }
    else
    {
	viewportwidth = document.getElementsByTagName("body")[0].clientWidth;
	viewportheight = document.getElementsByTagName("body")[0].clientHeight;
    }
    var xposition = (viewportwidth - 875) / 2;
    if(xposition < 0)
    {
	xposition = 0;
    }
    var aussen = document.getElementById("aussen");
    aussen.style.height = (viewportheight - 125) + "px";
    aussen.style.width = (viewportwidth) + "px";
    document.getElementById("inhalt").style.left = xposition + "px";
    aussen.style.visibility = "visible";
}

window.onload = function()
{
    getViewportSize();
    document.getElementById("inhalt").style.backgroundImage="url(bilder/hintergrund.gif?t=" + (new Date().getTime()) + ")";
}

window.onresize = getViewportSize;