/*
Onload
*/
window.onload = initCSS;

// initCSS: If there's a "TARAstyle" cookie,
// set the active stylesheet when the page loads
function initCSS()
{
    var     style = readCookie("TARAstyle");
    if (style) {
        activeCSS(style);
    }
}


/*
Switcher functions
*/

// activeCSS: Set the active stylesheet
function activeCSS(title)
{
    var     i,
            oneLink;
    for (i = 0; (oneLink = document.getElementsByTagName("link")[i]); i++) {
        if (oneLink.getAttribute("title") 
          && findWord("stylesheet", oneLink.getAttribute("rel"))) {
            oneLink.disabled = true;
            if (oneLink.getAttribute("title") == title) {
                oneLink.disabled = false;
            }
        }
    }
    setCookie("TARAstyle", title, 365);
}

// findWord: Used to find a full word (needle) in a string (haystack)
function findWord(needle, haystack)
{
    var     init = needle + "\\b";
    return haystack.match(needle + "\\b");
}


/*
Cookie functions
*/

// Set the cookie
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 {
        expires = "";
    }
    var cooked = name + "=" + value + expires + ";";
    document.cookie = cooked;
}


// Read the cookie
function readCookie(name)
{
    var     needle = name + "=";
    var     cookieArray = document.cookie.split(';');
    for (var i = 0; i < cookieArray.length; i++) {
        var     pair = cookieArray[i];
        while (pair.charAt(0) == ' ') {
            pair = pair.substring(1, pair.length);
        }
        if (pair.indexOf(needle) == 0) {
            return pair.substring(needle.length, pair.length);
        }
    }
    return null;
}