//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="random" //"manual" or "random"
var randomsetting="eachtime" //"eachtime", "sessiononly", or "x days (replace x with desired integer)". Only applicable if mode is random.
var styleCookieDays = 60;
var selectedsheet = "";

//////No need to edit beyond here//////////////
function setStylesheet(title, randomize)
{
	//Main stylesheet switcher function. Second parameter if defined causes a random alternate stylesheet (including none) to be enabled
	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);
		if (randomnumber == 0)
		{
			randomnumber = 1;
		}
		altsheets[randomnumber].disabled=false
	}
	
	selectedsheet = (typeof randomize!="undefined" && altsheets[randomnumber]!="")? altsheets[randomnumber].getAttribute("title") : "";
	return (typeof randomize!="undefined" && altsheets[randomnumber]!="")? altsheets[randomnumber].getAttribute("title") : "" //if in "random" mode, return "title" of randomly enabled alt stylesheet
}

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

function indicateSelectedStyle()
{
	var styleChoiceOptions = document.getElementById("ddlStyle").options;
	
	for (var i=0; i<styleChoiceOptions.length; i++)
	{
		if (styleChoiceOptions[i].value==selectedtitle)
		{
			//if match found between form element value and cookie value
			styleChoiceOptions[i].selected=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
	{
		// choose the first style from the drop down list, create it as a cookie and save it as the selected style
		setStylesheet("SilverSteel");	
	}
}
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
	} 
}