//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 setColor() {
    if (getCookie('color-background') != null) {
        document.bgColor= '#' + getCookie('color-background');
    } else {
        document.bgColor= '#94c946';
    }
}

function setearColorBackground(color) {
    setCookie('color-background', color, 1);
    document.bgColor= '#' + getCookie('color-background');
}

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
    }
}