/**
 * Positions a background image relative to the page.
 */
function background() {
    // Find the top left corner of the page.
    var pageTop  = document.getElementById('page').offsetTop;
    var pageLeft = document.getElementById('page').offsetLeft;

    // Compute the top left corner of the background image.
    var bgTop  = pageTop + 132;
    var bgLeft = pageLeft + 711;

    // Position the background image.
    var elements = document.getElementsByTagName('body');
    elements[0].style.backgroundPosition = bgLeft + 'px ' + bgTop + 'px';
}


// Run this function upon the onload event.
addOnLoad(background);