//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 nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function setCookie(name, value, days) {
    if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function deleteCookie(name){
    createCookie(name,"",-1);
}


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()=="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);
        loadFlash(styletitle);
    }
}

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
    } 
}