/*
	GetElementsByClassName developed by Robert Nyman, http://www.robertnyman.com
	Code/licensing: http://code.google.com/p/getelementsbyclassname/
*/


var getElementsByClassName = function (className, tag, elm){
	if (document.getElementsByClassName) {
		getElementsByClassName = function (className, tag, elm) {
			elm = elm || document;
			var elements = elm.getElementsByClassName(className),
				nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
				returnElements = [],
				current;
			for(var i=0, il=elements.length; i<il; i+=1){
				current = elements[i];
				if(!nodeName || nodeName.test(current.nodeName)) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	else if (document.evaluate) {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = "",
				xhtmlNamespace = "http://www.w3.org/1999/xhtml",
				namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
				returnElements = [],
				elements,
				node;
			for(var j=0, jl=classes.length; j<jl; j+=1){
				classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
			}
			try	{
				elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
			}
			catch (e) {
				elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
			}
			while ((node = elements.iterateNext())) {
				returnElements.push(node);
			}
			return returnElements;
		};
	}
	else {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = [],
				elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
				current,
				returnElements = [],
				match;
			for(var k=0, kl=classes.length; k<kl; k+=1){
				classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
			}
			for(var l=0, ll=elements.length; l<ll; l+=1){
				current = elements[l];
				match = false;
				for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
					match = classesToCheck[m].test(current.className);
					if (!match) {
						break;
					}
				}
				if (match) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	return getElementsByClassName(className, tag, elm);
};

/* End GetElementsByClassName */	


function child(elem, index) {
	// if index is not supplied, default is 1 
	index = index || 1; 
	// get first child element node of elem
	elem = (elem.firstChild && elem.firstChild.nodeType != 1) ?
		next(elem.firstChild) :
		elem.firstChild; 
	// use the index to move to nth-child element node                     
	for(var i=1; i < index; i++) {
		(function() {     
			return elem = next(elem);             
		})();            
	}
	return elem;
}

function next(elem) {
	do {
		elem = elem.nextSibling;
	} while (elem && elem.nodeType != 1);
	return elem;
}


function nidbardropdownonfocus() {

	/*
	Make suckerfish dropdowns keyboard accessible (Neil Blair 16/11/2009)
	Updated 5/4/2011 to fix IE quirks mode bugs
	*/
	
	var buttons = getElementsByClassName("nidbar-button");
	
	for (var i=0; i<buttons.length; i++) {
		
		// Find the first element which should be an anchor
		var anchor = child(buttons[i],1);
		
		
		if (anchor) {
		
			// Add onfocus and onblur functions to the anchor to show/hide any dropdowns
			anchor.onfocus=function(){
				this.parentNode.className+=" sfhover";
			};
			anchor.onblur=function(){
				this.parentNode.className=this.parentNode.className.replace(new RegExp(" sfhover\\b"), "");
			};
			
			// Ensure focus is removed onclick (to solve dropdown opening when user hits back button)
			anchor.onclick=function(){
				this.blur();
				return true;
			}
			
		}
		
		// Find the second element which should be the dropdown div
		var dropdown = child(buttons[i],2);
		
		if (dropdown) {
			
			// Find all anchors in the dropdown div
			var anchors = dropdown.getElementsByTagName("a");
			
			// Add onfocus and onblur functions to the anchor to show/hide the dropdown div
			// Also ensure focus removed when user clicks a link
			for (var j=0; j<anchors.length; j++) {
				
				eval("anchors[j].onfocus=function() {nidbarShowDropdown('" + dropdown.id + "');}");
				eval("anchors[j].onblur=function() {nidbarHideDropdown('" + dropdown.id + "');}");
				eval("anchors[j].onclick=function() {this.blur();return true;}");
				
			}
		}
		
	}
	
}

function nidbarShowDropdown(id) {
	document.getElementById(id).parentNode.className+=" sfhover";
	return true;
}

function nidbarHideDropdown(id) {
	var dropdownParent = document.getElementById(id).parentNode;
	dropdownParent.className=dropdownParent.className.replace(new RegExp(" sfhover\\b"), "");
	return true;
}

function addEvent(obj, evType, fn){ 
	if (obj.addEventListener) { 
		obj.addEventListener(evType, fn, false); 
		return true; 
	} else if (obj.attachEvent) { 
		var r = obj.attachEvent("on"+evType, fn); 
		return r; 
	} else { 
		return false; 
	} 
}

function isPropertySupported(property)
{
	return property in document.body.style;
}

function nidbardropdownshadow() {
	
	/* Add dropshadows to dropdowns using css3 or via other proprietry means */
	
	var dropdowns = getElementsByClassName("nidbar-dropdown");
	var cssProp;
	var cssValue = "0 2px 5px #999";
	
	if (isPropertySupported('boxShadow')) {
		cssProp = 'boxShadow';
	} 
	else if (isPropertySupported('MozBoxShadow')) {
		cssProp = 'MozBoxShadow';
	}
	else if (isPropertySupported('WebkitBoxShadow')) {
		cssProp = 'WebkitBoxShadow';
	}
	else if (isPropertySupported('oBoxShadow')) {
		cssProp = 'OBoxShadow';
	}
	
	if (cssProp) {
		for(var elem in dropdowns) {
			eval('dropdowns[elem].style.' + cssProp + '="' + cssValue + '";');
		}
	}
	
}

addEvent(window, 'load', nidbardropdownonfocus);
addEvent(window, 'load', nidbardropdownshadow);