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

// ver 1.1b bugfix for domain problem
// JM 04/20/2007
// http://www.jackmarvin.com/


// Select "manual" or "random"
var manual_or_random="random";

// How often to switch random style?
// "eachtime", "sessiononly", or "x days (replace x with desired integer)"
// Only applicable if mode is random
var randomsetting="sessiononly";

// Name your cookie
var cookiename = "stylecookie";

// Cookie path
var cookiepath = "/";

// Cookie domain or subdomain
var cookiedomain = ".domain.com";

// Cookie secure
var cookiesecure = "";


///////////////////////////////////////////////////////


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


// 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;
// Store reference to alt stylesheets inside array
altsheets.push(cacheobj);
// Enable alternate stylesheet with title that matches parameter
if(cacheobj.getAttribute("title") == title) {
// Enable chosen style sheet
cacheobj.disabled = false;
}
}
}
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") : "";
}


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


// Set cookie
function setCookie(name, value, days, path, domain, secure) { // JM 04/20/2007
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=/";
document.cookie = // JM 04/20/2007
name+"="+escape(value)+
(days ? "; expires="+expireDate.toGMTString() : "")+
(path ? "; path=" +path : "")+
(domain ? "; domain=" +domain : "")+
(secure ? "; secure" : "");
}


// Interface function to switch style sheets plus save "title" attr of selected stylesheet to cookie
function chooseStyle(styletitle, days){
if (document.getElementById){
setStylesheet(styletitle);
//setCookie("lpstyle", styletitle, days);
setCookie(cookiename, styletitle, days, cookiepath, cookiedomain, cookiesecure); // JM 04/20/2007
}
}


// Delete cookie
function deleteCookie(name){
setCookie(name, "moot");
}


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

///////////////////////////////////////////////////////