//Style Sheet Switcher version 1.1 Oct 10th, 2006
//Author: Dynamic Drive: http://www.dynamicdrive.com
//Usage terms: http://www.dynamicdrive.com/notice.htm

var manual_or_random="manual" //"manual" or "random"
var randomsetting="3 days" //"eachtime", "sessiononly", or "x days (replace x with desired integer)". Only applicable if mode is random.
var daysToPersistSelectedTheme = 60;
var inReverseMode = false;	// to track when we're in reverse mode

//------------------------------------------
/*
			Custom code
			Author: Jeff Litster
			http://www.javascriptjedi.com/
*/
//------------------------------------------

// needle is the value to look for; haystack is the array to look in.
function InArray(needle, haystack)
{
	if( haystack instanceof Array )
	{
		var arrCount = haystack.length;
		for( var i = 0; i < arrCount; i++ )
		{
			if( haystack[i] == needle )
				return true;
		}
	}
	else
		throw new Error('haystack is required to be an Array object.');
	
	return false;
}

function GetAlternateStylesheets()
{
	var altStylesheets = new Array();

	var linkElements = document.getElementsByTagName('link');
	if( linkElements )
	{
		var numLinkElements = linkElements.length;

		for( var i = 0; i < numLinkElements; i++ )
		{
			var curLinkElement = linkElements[i];
			var isAlternateStylesheet = curLinkElement.getAttribute("rel").toLowerCase()=="alternate stylesheet";
			var title = curLinkElement.getAttribute("title");
			if( isAlternateStylesheet && typeof(title) == "string" && title.length > 0 )
			{
				altStylesheets[altStylesheets.length] = curLinkElement;
			}
		}
	}
	
	return altStylesheets;
}


function DisableAllAlternateStylesheets()
{
	var altStylesheets = GetAlternateStylesheets();
	if( altStylesheets )
	{
		var numAltStylesheets = altStylesheets.length;
		for( var i = 0; i < numAltStylesheets; i++ )
			altStylesheets[i].disabled = true;
	}
}


function GetCurrentStyleThemeTitle()
{
	var title = '';

	var altStylesheets = GetAlternateStylesheets();
	if( altStylesheets )
	{
		var numStylesheets = altStylesheets.length;
		
		for( var i = 0; i < numStylesheets; i++ )
		{
			var curStylesheet = altStylesheets[i];
			if( !curStylesheet.disabled )
			{
				if( title.length > 0 )
					title += '|';
				title += curStylesheet.title;
			}
		}
	}
	
	return title;
}


function chooseReverseStyle( daysToPersist )
{
	var styleChooserReverseThemeTitle = "reverse_theme";	// customize this if you want to name your reverse theme differently.
	var re_ReverseThemeOn = new RegExp('(^|[|])' + styleChooserReverseThemeTitle + '([|]|$)', 'i');
	var re_StripBeginningAndEndSlash = /(^[|])|([|]$)/;
	var curStyleThemeTitle = GetCurrentStyleThemeTitle();
	var reverseThemeTitle = '';
	
	// if reverse mode is on... turn it off.
	if( re_ReverseThemeOn.test(curStyleThemeTitle) )
	{
		reverseThemeTitle = curStyleThemeTitle.replace(re_ReverseThemeOn, '|');
		reverseThemeTitle = reverseThemeTitle.replace(re_StripBeginningAndEndSlash, '');
	}
	else
	{
		reverseThemeTitle = curStyleThemeTitle + '|' + styleChooserReverseThemeTitle;
	}
	
	chooseStyle(reverseThemeTitle, daysToPersistSelectedTheme);
}

//////No need to edit beyond here//////////////

function getCookie(Name) { 
var re=new RegExp(Name+"=[^;]+", "i"); //construct RE to search for target name/value pair
if (document.cookie.match(re)) //if cookie found
return document.cookie.match(re)[0].split("=")[1] //return its value
return null
}

function setCookie(name, value, days) {
var expireDate = new Date()
//set "expstring" to either future or past date, to set or delete cookie, respectively
var expstring=(typeof days!="undefined")? expireDate.setDate(expireDate.getDate()+parseInt(days)) : expireDate.setDate(expireDate.getDate()-5)
document.cookie = name+"="+value+"; expires="+expireDate.toGMTString()+"; path=/";
}

function deleteCookie(name){
setCookie(name, "moot")
}

//-----------------------

// Modded version - to allow multiple stylesheets to be activated...
function setStylesheet(pipeDelimitedTitles, randomize)
{
	//reset all alternate stylesheets to disabled
	DisableAllAlternateStylesheets();
	
	var altStylesheets = GetAlternateStylesheets();
	var numAltStylesheets = altStylesheets.length;
	
	// randomize a stylesheet if requested...
	var randomStylesheetTitle = '';
	if (typeof(randomize) != "undefined") //if second paramter is defined, randomly enable an alt style sheet (includes non)
	{
		var randomnumber = Math.ceil(Math.random() * numAltStylesheets);
		if( randomnumber == numAltStylesheets )
		{
			randomStylesheetTitle = '';
		}
		else
		{
			var randomStylesheet = altStylesheets[randomnumber];
			randomStylesheet.disabled = false;
			randomStylesheetTitle = randomStylesheet.title;
		}
	}
	else	//... otherwise, enable all asked for.
	{
		var titles = pipeDelimitedTitles.split('|');
		var numTitles = titles.length;
		
		// loop through the titles and enable each matching stylesheet
		for( var i = 0; i < numTitles; i++ )
		{
			var curTitle = titles[i].toLowerCase();
			for( var j = 0; j < numAltStylesheets; j++ )
			{
				var curStylesheet = altStylesheets[j];
				if( curStylesheet.title.toLowerCase() == curTitle )
				{
					// enable the stylesheet
					curStylesheet.disabled = false;
					break;
				}
			}
		}
	}
	
	//return what stylesheet(s) was/were activated.
	return (typeof(randomize) != "undefined") ? randomStylesheetTitle : pipeDelimitedTitles;
}

//-----------------------

//Main stylesheet switcher function. Second parameter if defined causes a random alternate stylesheet (including none) to be enabled
/*
function setStylesheet(title, randomize)
{ 
	var i, cacheobj, altsheets=[""];
	for(i=0; (cacheobj=document.getElementsByTagName("link")[i]); i++) 
	{
		if(cacheobj.getAttribute("rel").toLowerCase()=="alternate stylesheet" && cacheobj.getAttribute("title"))  //if this is an alternate stylesheet with title
		{
			cacheobj.disabled = true;
			altsheets.push(cacheobj); //store reference to alt stylesheets inside array
			if(cacheobj.getAttribute("title") == title) //enable alternate stylesheet with title that matches parameter
				cacheobj.disabled = false; //enable chosen style sheet
		}
	}
	
	if (typeof(randomize) != "undefined") //if second paramter is defined, randomly enable an alt style sheet (includes non)
	{
		var randomnumber = Math.floor(Math.random()*altsheets.length);
		altsheets[randomnumber].disabled = false;
	}
	
	//if in "random" mode, return "title" of randomly enabled alt stylesheet
	return (typeof(randomize) != "undefined" && altsheets[randomnumber] != "") ? altsheets[randomnumber].getAttribute("title") : "";
}
*/

function chooseStyle(styletitle, days){ //Interface function to switch style sheets plus save "title" attr of selected stylesheet to cookie
if (document.getElementById){
setStylesheet(styletitle)
setCookie("mysheet", styletitle, days)
}
}

function indicateSelected(element){ //Optional function that shows which style sheet is currently selected within group of radio buttons or select menu
if (selectedtitle!=null && (element.type==undefined || element.type=="select-one")){ //if element is a radio button or select menu
var element=(element.type=="select-one") ? element.options : element
for (var i=0; i<element.length; i++){
if (element[i].value==selectedtitle){ //if match found between form element value and cookie value
if (element[i].tagName=="OPTION") //if this is a select menu
element[i].selected=true
else //else if it's a radio button
element[i].checked=true
break
}
}
}
}

if (manual_or_random=="manual"){ //IF MANUAL MODE
var selectedtitle=getCookie("mysheet")
if (document.getElementById && selectedtitle!=null) //load user chosen style sheet from cookie if there is one stored
setStylesheet(selectedtitle)
}
else if (manual_or_random=="random"){ //IF AUTO RANDOM MODE
if (randomsetting=="eachtime")
setStylesheet("", "random")
else if (randomsetting=="sessiononly"){ //if "sessiononly" setting
if (getCookie("mysheet_s")==null) //if "mysheet_s" session cookie is empty
document.cookie="mysheet_s="+setStylesheet("", "random")+"; path=/" //activate random alt stylesheet while remembering its "title" value
else
setStylesheet(getCookie("mysheet_s")) //just activate random alt stylesheet stored in cookie
}
else if (randomsetting.search(/^[1-9]+ days/i)!=-1){ //if "x days" setting
if (getCookie("mysheet_r")==null || parseInt(getCookie("mysheet_r_days"))!=parseInt(randomsetting)){ //if "mysheet_r" cookie is empty or admin has changed number of days to persist in "x days" variable
setCookie("mysheet_r", setStylesheet("", "random"), parseInt(randomsetting)) //activate random alt stylesheet while remembering its "title" value
setCookie("mysheet_r_days", randomsetting, parseInt(randomsetting)) //Also remember the number of days to persist per the "x days" variable
}
else
setStylesheet(getCookie("mysheet_r")) //just activate random alt stylesheet stored in cookie
} 
}