function disappear ()
{
	navig.style.visibility="hidden";
}
function reappear ()
{
	navig.style.visibility="visible";
}

function realPosition ()
{
	navig.style.left=getLeftPosition("about");
	navig.style.top=getTopPosition("about");
}

function getLeftPosition(elemID) {
    var offsetTrail = document.getElementById(elemID);
    var offsetLeft = 0;
    while (offsetTrail) {
        offsetLeft += offsetTrail.offsetLeft;
        offsetTrail = offsetTrail.offsetParent;
    }
    if (navigator.userAgent.indexOf("Mac") != -1 && 
        typeof document.body.leftMargin != "undefined") {
        offsetLeft += document.body.leftMargin;
    }
    return offsetLeft+116;
}
function getTopPosition(elemID) {
    var offsetTrail = document.getElementById(elemID);
    var offsetTop = 0;
    while (offsetTrail) {
        offsetTop += offsetTrail.offsetTop;
        offsetTrail = offsetTrail.offsetParent;
    }
    if (navigator.userAgent.indexOf("Mac") != -1 && 
        typeof document.body.leftMargin != "undefined") {
        offsetTop += document.body.topMargin;
    }
    return offsetTop+1;
}