/*  usage

$('#id').click(function(){

$('#idto').ScrollTo(800);

return false;

});



*/



jQuery.getPos = function(e) {

    var l = 0;

    var t = 0;

    var w = jQuery.intval(jQuery.css(e, 'width'));

    var h = jQuery.intval(jQuery.css(e, 'height'));

    var wb = e.offsetWidth;

    var hb = e.offsetHeight;

    while (e.offsetParent) {

        l += e.offsetLeft + (e.currentStyle ? jQuery.intval(e.currentStyle.borderLeftWidth) : 0);

        t += e.offsetTop + (e.currentStyle ? jQuery.intval(e.currentStyle.borderTopWidth) : 0);

        e = e.offsetParent;

    }

    l += e.offsetLeft + (e.currentStyle ? jQuery.intval(e.currentStyle.borderLeftWidth) : 0);

    t += e.offsetTop + (e.currentStyle ? jQuery.intval(e.currentStyle.borderTopWidth) : 0);

    return { x: l, y: t, w: w, h: h, wb: wb, hb: hb };

};

jQuery.getClient = function(e) {

    if (e) {

        w = e.clientWidth;

        h = e.clientHeight;

    } else {

        w = (window.innerWidth) ? window.innerWidth : (document.documentElement && document.documentElement.clientWidth) ? document.documentElement.clientWidth : document.body.offsetWidth;

        h = (window.innerHeight) ? window.innerHeight : (document.documentElement && document.documentElement.clientHeight) ? document.documentElement.clientHeight : document.body.offsetHeight;

    }

    return { w: w, h: h };

};

jQuery.getScroll = function(e) {

    if (e) {

        t = e.scrollTop;

        l = e.scrollLeft;

        w = e.scrollWidth;

        h = e.scrollHeight;

    } else {

        if (document.documentElement && document.documentElement.scrollTop) {

            t = document.documentElement.scrollTop;

            l = document.documentElement.scrollLeft;

            w = document.documentElement.scrollWidth;

            h = document.documentElement.scrollHeight;

        } else if (document.body) {

            t = document.body.scrollTop;

            l = document.body.scrollLeft;

            w = document.body.scrollWidth;

            h = document.body.scrollHeight;

        }

    }

    return { t: t, l: l, w: w, h: h };

};



jQuery.intval = function(v) {

    v = parseInt(v);

    return isNaN(v) ? 0 : v;

};



jQuery.fn.ScrollTo = function(s) {

    o = jQuery.speed(s);

    return this.each(function() {

        new jQuery.fx.ScrollTo(this, o);

    });

};



jQuery.fx.ScrollTo = function(e, o) {

    var z = this;

    z.o = o;

    z.e = e;

    z.p = jQuery.getPos(e);

    z.s = jQuery.getScroll();

    z.clear = function() { clearInterval(z.timer); z.timer = null };

    z.t = (new Date).getTime();

    z.step = function() {

        var t = (new Date).getTime();

        var p = (t - z.t) / z.o.duration;

        if (t >= z.o.duration + z.t) {

            z.clear();

            setTimeout(function() { z.scroll(z.p.y, z.p.x) }, 13);

        } else {

            st = ((-Math.cos(p * Math.PI) / 2) + 0.5) * (z.p.y - z.s.t) + z.s.t;

            sl = ((-Math.cos(p * Math.PI) / 2) + 0.5) * (z.p.x - z.s.l) + z.s.l;

            z.scroll(st, sl);

        }

    };

    z.scroll = function(t, l) { window.scrollTo(l, t) };

    z.timer = setInterval(function() { z.step(); }, 13);

};