var bTooltipVisible = false;

function moveTooltip(e) {
    if (bTooltipVisible == true) {
        if (navigator.appName != "Microsoft Internet Explorer") {
            document.getElementById("tooltip").style.left = e.pageX  +  10 + "px";
            document.getElementById("tooltip").style.top = e.pageY  +  -22 + "px";
        } else {
            if (document.documentElement.clientWidth > 0) {
                document.getElementById("tooltip").style.left = 10 + event.x + document.documentElement.scrollLeft + "px";
                document.getElementById("tooltip").style.top = -22 + event.y + document.documentElement.scrollTop + "px";
            } else {
                document.getElementById("tooltip").style.left = 10 + event.x + document.body.scrollLeft + "px";
                document.getElementById("tooltip").style.top = -22 + event.y + document.body.scrollTop + "px";
            }
        }
    }
}

function showTooltip(text) {
    if (bTooltipVisible == false) {
        document.getElementById("tooltip").style.visibility = "visible";
        document.getElementById("tooltip").innerHTML = text;
        bTooltipVisible = true;
    } else {
        document.getElementById("tooltip").style.visibility = "hidden";
        bTooltipVisible = false;
    }
}

document.onmousemove = moveTooltip;