Height div to window height with scroll

Java > Height div to window height with scroll

<script type="text/javascript" language="javascript">

    window.onload = function () { SizeDiv(); }

    function getDocHeight() {

        var D = document;

        return Math.max(

        Math.max(D.body.scrollHeight, D.documentElement.scrollHeight),

        Math.max(D.body.offsetHeight, D.documentElement.offsetHeight),

        Math.max(D.body.clientHeight, D.documentElement.clientHeight)
    );

    }

    function SizeDiv() {
        
        document.getElementById('leftCol').style.height = getDocHeight()-175 + "px";
     
    }

</script>