function setVariables() {
imgwidth = 120; // logo width, in pixels
imgheight = 49; // logo height, in pixels
}

function checkLocation() {
availableY = document.body.clientHeight;
currentY = document.body.scrollTop;
y = availableY - (imgheight+20) + currentY;

document.getElementById('branding').style.top = y;
setTimeout("checkLocation()",1);
}