/* 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 (!destinationLink) destinationLink = document.getElementById(anchor);

    // 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 = 25;

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

/* http://jsajax.com/ShowHelpArticle681.aspx */
var ns6 = document.getElementById && !document.all;
var ie = document.all;
var pop = function() {
	var speed = 20;
	var timer = 200;
	var timer_end = 200;
	var alpha = 60;
	var alphaend = 93;
	var horizontal_offset = vertical_offset = 10;
	var objpop;
	return {
		getposOffset:function(what, type) {
			var totaloffset = (type=="left") ? what.offsetLeft : what.offsetTop;
			var parentEl = what.offsetParent;
			while(parentEl!=null) {
				totaloffset = (type=="left") ? totaloffset + parentEl.offsetLeft : totaloffset + parentEl.offsetTop;
				parentEl = parentEl.offsetParent;
			}
			return totaloffset;
		},
		iecompattest:function() {
			return (document.compatMode && document.compatMode!="BackCompat") ? document.documentElement : document.body;
		},
		clearbrowseredge:function(obj, whichedge) {
			var edgeoffset = (whichedge=="rightedge") ? parseInt(horizontal_offset) * -1 : parseInt(vertical_offset) * -1;
			if(whichedge=="rightedge") {
				var windowedge = (ie && !window.opera) ? pop.iecompattest().scrollLeft + pop.iecompattest().clientWidth - 30 : window.pageXOffset + window.innerWidth - 40;
				objpop.contentmeasure = objpop.offsetWidth;
				if(windowedge - objpop.x < objpop.contentmeasure) {
					edgeoffset = objpop.contentmeasure + obj.offsetWidth + parseInt(horizontal_offset);
				}
			}else {
				var windowedge = (ie && !window.opera) ? pop.iecompattest().scrollTop + pop.iecompattest().clientHeight - 15 : window.pageYOffset + window.innerHeight - 18;
				objpop.contentmeasure = objpop.offsetHeight;
				if(windowedge - objpop.y < objpop.contentmeasure) {
					edgeoffset = objpop.contentmeasure - obj.offsetHeight;
				}
			}
			return edgeoffset
		},
		createhintbox:function() {
			objpop = document.createElement("div");
			objpop.setAttribute("id", "hintbox");
			document.body.appendChild(objpop);
			objpop.style.opacity = 0;
			objpop.style.filter = 'alpha(opacity=0)';
		},
		show:function(text, obj, e, tipwidth, jd) {
			if((ie || ns6) && $("hintbox")) {
				objpop.innerHTML = text;
				objpop.style.width = tipwidth;
				objpop.x = pop.getposOffset(obj, "left");
				objpop.y = pop.getposOffset(obj, "top");
				objpop.style.left = objpop.x - pop.clearbrowseredge(obj, "rightedge") + obj.offsetWidth + "px";
				objpop.style.top = objpop.y - pop.clearbrowseredge(obj, "bottomedge") + "px";
				objpop.style.visibility = "visible";
				pop.fadestart(e, 1);
				obj.onmouseout = pop.fadeout;
			}
		},
/* http://www.leigeber.com/2008/06/javascript-tooltip/ */
		fadestart:function(e, sx) {
			sx = (sx) ? sx : -1;
			clearInterval(objpop.timer);
			objpop.timer = setInterval(
				function() {
					pop.fade(sx);
				}, timer
			);
		},
		fadeout:function(e) {
			clearInterval(objpop.timer_end);
			pop.timer_end = setTimeout('pop.fadestart()', timer_end)
		},
		fade:function(d) {
			var ids = objpop.style;
			if((alpha!=alphaend && d==1) || (alpha!=0 && d==-1)) {
				var i = (d==-1) ? speed : speed*3;
				if(alphaend - alpha < i && d==1) {
					i = alphaend - alpha;
				}else if(alpha < i && d==-1) {
					i = alpha;
				}
				alpha = alpha + (i * d);
				ids.opacity = alpha * 0.01;
				ids.filter = 'alpha(opacity=' + alpha + ')';
			}else if(d==-1) {
				ids.visibility = "hidden";
			}
		}
	};
}();
if(window.addEventListener) {
	window.addEventListener("load", pop.createhintbox, false);
}else if(window.attachEvent) {
	window.attachEvent("onload", pop.createhintbox);
}else if(document.getElementById) {
	window.onload = pop.createhintbox;
}