function backToTop() {
    var x1 = x2 = x3 = 0;
    var y1 = y2 = y3 = 0;

    if (document.documentElement) {
        x1 = document.documentElement.scrollLeft || 0;
        y1 = document.documentElement.scrollTop || 0;
    }

    if (document.body) {
        x2 = document.body.scrollLeft || 0;
        y2 = document.body.scrollTop || 0;
    }

    x3 = window.scrollX || 0;
    y3 = window.scrollY || 0;

    var x = Math.max(x1, Math.max(x2, x3));
    var y = Math.max(y1, Math.max(y2, y3));

    window.scrollTo(Math.floor(x / 2), Math.floor(y / 2));

    if (x > 0 || y > 0) {
        window.setTimeout("backToTop()", 50);
    }
}


var fastScrolling=0; 
function _gotop() 
{     
    if (fastScrolling!=0) 
        scrollTo(0,0); 
    else{ 
        var ts=0; 
        if (document.layers) 
            ts=window.pageYOffset; 
        else if (document.body.scroll) 
            ts=document.body.scroll; 
        else 
            ts=window.pageYOffset; 
        if (ts>0){ 
            var nv=(ts-5)*0.2; 
            if (nv<1) nv=1; 
            scrollBy(0,-nv); 
            setTimeout("_gotop()",50); 
        } 
    } 
}