//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.

//////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")
}

function setStylesheet(title) {
	var lnks = document.getElementsByTagName('link');
	for (var i = lnks.length - 1; i >= 0; i--) {
		if (lnks[i].getAttribute('rel').indexOf('style')> -1 && lnks[i].getAttribute('title')) {
			lnks[i].disabled = true;
			if (lnks[i].getAttribute('title') == title) {
				lnks[i].disabled = false;
			}
		}
	}
}

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
	} 
}