window.onload = initPage;
window.onresize = initPage;

function initPage() {

    // Get paragraph height/width
    var paragraph = document.getElementById('deadcentre');
    var paragraphHeight = paragraph.offsetHeight;

    // Get browser window height
    var windowHeight = getWindowHeight();

    // Set paragraph area on page
    paragraph.style.position = 'absolute';
    paragraph.style.top = ((windowHeight - 130 - paragraphHeight) / 2) + 'px';

}

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;
};