var selectedtitle;

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) {
	var i, cacheobj
	for(i=0; (cacheobj=document.getElementsByTagName("link")[i]); i++) {
		if(cacheobj.getAttribute("rel").indexOf("style") != -1 && cacheobj.getAttribute("title")) {
			cacheobj.disabled = true
			if(cacheobj.getAttribute("title") == title)
				cacheobj.disabled = false //enable chosen style sheet
		}
	}
}

function chooseStyle(styletitle, days){
	if (document.getElementById){
		setStylesheet(styletitle)
		setCookie("mysheet", styletitle, days)
		selectedtitle = styletitle;
	}
}

function indicateSelected(element){ //Optional function that shows which style sheet is currently selected within group of radio buttons or select menu
	var i
	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 (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
			}
		}
	}
}

selectedtitle=getCookie("mysheet")
if (document.getElementById && selectedtitle!=null) //load user chosen style sheet if there is one stored
setStylesheet(selectedtitle)