window.onload = resizeWindow;

function resizeWindow(){
    var hoogteScherm    = document.documentElement.clientHeight;
    var hoogteBody      = document.body.clientHeight;
    if(hoogteBody<hoogteScherm && document.getElementById("innercontainer")){
        document.getElementById("innercontainer").style.height  = (hoogteScherm-118)+"px";
        document.getElementById("footer").style.position        = "absolute";
        document.getElementById("footer").style.bottom          = "0px";
    }
}