//Style Sheet Switcher version 1.0 Nov 9th, 2005
//Author: Dynamic Drive: http://www.dynamicdrive.com
//Usage terms: http://www.dynamicdrive.com/notice.htm

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)
    }
}

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
}
}
}
}

/*var selectedtitle = getCookie("mysheet")

if (document.getElementById && selectedtitle!=null)
{
    //load user chosen style sheet if there is one stored
    setStylesheet(selectedtitle)
}*/

/* *** */

var DEFAULT_FONT_SIZE = 62.5;
var MIN_FONT_SIZE = 37.5;
var MAX_FONT_SIZE = 125;
var FONT_SIZE_INC = 12.5;
var DEFAULT_COOKIE_LIFETIME = 60;

function increaseFontSize()
{
    var currentFontSize = getCookie("fontsize");

    if (currentFontSize == null)
    {
        currentFontSize = DEFAULT_FONT_SIZE; // reset to default
    }
    else
    {
        currentFontSize = parseFloat(currentFontSize);
        if (currentFontSize <= (MAX_FONT_SIZE-FONT_SIZE_INC)) currentFontSize += FONT_SIZE_INC;
        if (currentFontSize > MAX_FONT_SIZE) currentFontSize = MAX_FONT_SIZE;
    }

    setCookie("fontsize", currentFontSize, DEFAULT_COOKIE_LIFETIME);
    setBodyFontSize();
}

function decreaseFontSize()
{
    var currentFontSize = getCookie("fontsize");
    
    if (currentFontSize == null)
    {
        currentFontSize = DEFAULT_FONT_SIZE; // reset to default
    }
    else
    {
        currentFontSize = parseFloat(currentFontSize);
        if (currentFontSize >= (MIN_FONT_SIZE + FONT_SIZE_INC)) currentFontSize -= FONT_SIZE_INC;
        if (currentFontSize < MIN_FONT_SIZE) currentFontSize = MIN_FONT_SIZE;
    }

    setCookie("fontsize", currentFontSize, DEFAULT_COOKIE_LIFETIME);
    setBodyFontSize();
}

function resetFontSize()
{
    setCookie("fontsize", DEFAULT_FONT_SIZE, DEFAULT_COOKIE_LIFETIME);
    setBodyFontSize();
}

function setSelectedFontSize()
{
    var sizeSelect = $id('fontsize-select');
    var fontSize = sizeSelect.options[sizeSelect.selectedIndex].value;
    
    setCookie("fontsize", fontSize, DEFAULT_COOKIE_LIFETIME);
    setBodyFontSize();
}

function setBodyFontSize()
{
    var bodyFontSize = getCookie("fontsize");

    bodyFontSize = (bodyFontSize != null) ? parseFloat(bodyFontSize) : DEFAULT_FONT_SIZE;

    // out of range values case
    if (bodyFontSize < MIN_FONT_SIZE)
    {
        bodyFontSize = MIN_FONT_SIZE;
        setCookie("fontsize", bodyFontSize, DEFAULT_COOKIE_LIFETIME);
    }

    if (bodyFontSize > MAX_FONT_SIZE)
    {
        bodyFontSize = MAX_FONT_SIZE;
        setCookie("fontsize", bodyFontSize, DEFAULT_COOKIE_LIFETIME);
    }

    document.body.style.fontSize = bodyFontSize+'%';

    var sizeSelect = $id('fontsize-select');
    var optsCount = sizeSelect.options.length;
    for (var i=0; i<optsCount; i++)
    {
        if (sizeSelect.options[i].value == bodyFontSize) sizeSelect.selectedIndex = i;
    }
}