//<![CDATA[
var goto_top_type = -1;
var goto_top_itv = 0;

function GoToTopTimer() {
    var y = goto_top_type == 1 ? document.documentElement.scrollTop : document.body.scrollTop;
    var moveby = 15;

    y -= Math.ceil(y * moveby / 100);
    if (y < 0) {
        y = 0;
    }

    if (goto_top_type == 1) {
        document.documentElement.scrollTop = y;
    }
    else {
        document.body.scrollTop = y;
    }

    if (y == 0) {
        clearInterval(goto_top_itv);
        goto_top_itv = 0;
    }
}

function GoToTop() {
    if (goto_top_itv == 0) {
        if (document.documentElement && document.documentElement.scrollTop) {
            goto_top_type = 1;
        }
        else if (document.body && document.body.scrollTop) {
            goto_top_type = 2;
        }
        else {
            goto_top_type = 0;
        }

        if (goto_top_type > 0) {
            goto_top_itv = setInterval('GoToTopTimer()', 10);
        }
    }
}

//]]>