//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


} 


}