//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, 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
	                            		var mytitle = cacheobj.getAttribute("title");
	                            		if (mytitle == "small-text" || mytitle == "large-text") {
		                            		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
	}
	return (typeof randomize!="undefined" && altsheets[randomnumber]!="")? altsheets[randomnumber].getAttribute("title") : "" //if in "random" mode, return "title" of randomly enabled alt stylesheet
}

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
		} 
}