function resize_block() {

        //Firefox
        var height=window.innerHeight;

        if (document.body.clientHeight) {

                // IE
                height=document.body.clientHeight;
        }

        //resize the div block & iframe according to the size of the window
        var blockh = parseInt(height-document.getElementById("content1").offsetTop-40)+"px";

        document.getElementById("content1").style.height=blockh;
        document.getElementById("content").style.height=blockh;
}