function initScrollLayer() {
    var wndo = new dw_scrollObj('wn', 'lyr1', 'imgTbl');
}

var current_circle = 1;
function swapCircleImage(num) {
    if ( document.images ) {
        var img = document.images['circle' + num];
        if (img) {
            img.src = "/images/circle-solid.gif";
            document.images['circle' + current_circle].src = "/images/circle-open.gif";
            current_circle = num;
        }
    }
}


if (document.images) {
var guide1 = new Image(); guide1.src = "/images/nav-guide-off.jpg";
var guide2 = new Image(); guide2.src = "/images/nav-guide-on.jpg";
var photo1 = new Image(); photo1.src = "/images/nav-photo-off.jpg";
var photo2 = new Image(); photo2.src = "/images/nav-photo-on.jpg";
var webdev1 = new Image(); webdev1.src = "/images/nav-webdev-off.jpg";
var webdev2 = new Image(); webdev2.src = "/images/nav-webdev-on.jpg";
var gallery1 = new Image(); gallery1.src = "/images/nav-galleries-off.jpg";
var gallery2 = new Image(); gallery2.src = "/images/nav-galleries-on.jpg";
var about1 = new Image(); about1.src = "/images/nav-about-off.jpg";
var about2 = new Image(); about2.src = "/images/nav-about-on.jpg";
var main2 = new Image(); main2.src = "/images/home-main2.jpg";
var main3 = new Image(); main3.src = "/images/home-main3.jpg";
}


function turnOn(imageName) {
  if (document.images) {
    document[imageName].src = eval(imageName + "2.src");
  }
}

function turnOff(imageName) {
  if (document.images) {
    document[imageName].src = eval(imageName + "1.src");
  }
}

var detect = navigator.userAgent.toLowerCase();
var OS,browser,version,total,thestring;

if (checkIt('konqueror'))
{
        browser = "Konqueror";
        OS = "Linux";
}
else if (checkIt('safari')) browser = "Safari"
else if (checkIt('omniweb')) browser = "OmniWeb"
else if (checkIt('opera')) browser = "Opera"
else if (checkIt('webtv')) browser = "WebTV";
else if (checkIt('icab')) browser = "iCab"
else if (checkIt('msie')) browser = "Internet Explorer"
else if (checkIt('firefox')) browser = "Firefox"
else if (!checkIt('compatible'))
{
        browser = "a Mozilla compatible browser"
       
}
else browser = "An unknown browser";

if (!OS)
{
        if (checkIt('linux')) OS = "Linux";
        else if (checkIt('x11')) OS = "Unix";
        else if (checkIt('mac')) OS = "a Mac"
        else if (checkIt('win')) OS = "a Windows machine"
        else OS = "a unique operating system";
}

function checkIt(string)
{
        place = detect.indexOf(string) + 1;
        thestring = string;
        return place;
} 


/* Smooth scrolling
   Changes links that link to other parts of this page to scroll
   smoothly to those links rather than jump to them directly, which
   can be a little disorienting.
   
   sil, http://www.kryogenix.org/
   
   v1.0 2003-11-11
   v1.1 2005-06-16 wrap it up in an object
*/

var ss = {
  fixAllLinks: function() {
    // 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',ss.smoothScroll);
      }
    }
  },

  smoothScroll: function(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.nodeName.toLowerCase() != 'a') {
      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();
    }
  },

  scrollWindow: function(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;
    }
  },

  getCurrentYPos: function() {
    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;
  },

  addEvent: function(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;
    } else {
      alert("Handler could not be removed");
    }
  } 
}

ss.STEPS = 20;

ss.addEvent(window,"load",ss.fixAllLinks);

/* Smooth scrolling END */