//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  
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  
}   
}