﻿function ss_fixAllLinks() {
    // Get a list of all links in the page
    var allLinks = document.getElementsByTagName('a');
    // Walk through the list
    for (var i = 0; i < allLinks.length; i++) {
        var lnk = allLinks[i];

        if ((lnk.href && lnk.href.indexOf('#') != -1) &&
       ((lnk.pathname == location.pathname) ||
   ('/' + lnk.pathname == location.pathname)) &&
       (lnk.search == location.search)) {
            // If the link is internal to the page (begins in #)
            // then attach the smoothScroll function as an onclick
            // event handler
            ss_addEvent(lnk, 'click', smoothScroll);
        }
    }
}

function smoothScroll(e) {
    // This is an event handler; get the clicked on element,
    // in a cross-browser fashion
    if (window.event) {
        target = window.event.srcElement;
    } else if (e) {
        target = e.target;
    } else return;

    // Make sure that the target is an element, not a text node
    // within an element
    if (target.nodeType == 3) {
        target = target.parentNode;
    }

    // Paranoia; check this is an A tag
    if (target.nodeName.toLowerCase() != 'a') return;

    // Find the <a name> tag corresponding to this href
    // First strip off the hash (first character)
    anchor = target.hash.substr(1);
    // Now loop all A tags until we find one with that name
    var allLinks = document.getElementsByTagName('a');
    var destinationLink = null;
    for (var i = 0; i < allLinks.length; i++) {
        var lnk = allLinks[i];
        if (lnk.name && (lnk.name == anchor)) {
            destinationLink = lnk;
            break;
        }
    }

    // If we didn't find a destination, give up and let the browser do
    // its thing
    if (!destinationLink) return true;

    // Find the destination's position
    var destx = destinationLink.offsetLeft;
    var desty = destinationLink.offsetTop;
    var thisNode = destinationLink;
    while (thisNode.offsetParent &&
       (thisNode.offsetParent != document.body)) {
        thisNode = thisNode.offsetParent;
        destx += thisNode.offsetLeft;
        desty += thisNode.offsetTop;
    }

    // Stop any current scrolling
    clearInterval(ss_INTERVAL);

    cypos = ss_getCurrentYPos();

    ss_stepsize = parseInt((desty - cypos) / ss_STEPS);
    ss_INTERVAL = setInterval('ss_scrollWindow(' + ss_stepsize + ',' + desty + ',"' + anchor + '")', 10);

    // And stop the actual click happening
    if (window.event) {
        window.event.cancelBubble = true;
        window.event.returnValue = false;
    }
    if (e && e.preventDefault && e.stopPropagation) {
        e.preventDefault();
        e.stopPropagation();
    }
}

function ss_scrollWindow(scramount, dest, anchor) {
    wascypos = ss_getCurrentYPos();
    isAbove = (wascypos < dest);
    window.scrollTo(0, wascypos + scramount);
    iscypos = ss_getCurrentYPos();
    isAboveNow = (iscypos < dest);
    if ((isAbove != isAboveNow) || (wascypos == iscypos)) {
        // if we've just scrolled past the destination, or
        // we haven't moved from the last scroll (i.e., we're at the
        // bottom of the page) then scroll exactly to the link
        window.scrollTo(0, dest);
        // cancel the repeating timer
        clearInterval(ss_INTERVAL);
        // and jump to the link directly so the URL's right
        location.hash = anchor;
    }
}

function ss_getCurrentYPos() {
    if (document.body && document.body.scrollTop)
        return document.body.scrollTop;
    if (document.documentElement && document.documentElement.scrollTop)
        return document.documentElement.scrollTop;
    if (window.pageYOffset)
        return window.pageYOffset;
    return 0;
}

function ss_addEvent(elm, evType, fn, useCapture)
// addEvent and removeEvent
// cross-browser event handling for IE5+,  NS6 and Mozilla
// By Scott Andrew
{
    if (elm.addEventListener) {
        elm.addEventListener(evType, fn, useCapture);
        return true;
    } else if (elm.attachEvent) {
        var r = elm.attachEvent("on" + evType, fn);
        return r;
    }
}

var ss_INTERVAL;
var ss_STEPS = 25;

//ss_addEvent(window, "load", ss_fixAllLinks);