/* $Id: styleswitcher.js 637 2006-11-15 18:11:12Z tas $

   This script is a cheap hack.

   Author: Timothy Stotts
   Site:   http://tstotts.net/

   Public Domain (or whatever license you like best)
*/

function setActiveStyle(title) {
    setActiveStyleSheet(title);
    setActiveStyleLogo(title);
    setActiveStyleIcon(title);
}

function setActiveStyleIcon(title) {
    var l, l1, l2, i, h;

    h = document.getElementsByTagName("head")[0]

    /* remove current icon links */
    l = h.getElementsByTagName("link");
    for (i=0; i<l.length; ++i) {
	if (l[i].type == "image/x-icon" && (l[i].rel=="icon" || l[i].rel=="shortcut icon")) {
	    h.removeChild(l[i]);
	}
    }

    /* add new icon links */
    l1 = document.createElement("link");
    l1.type = "image/x-icon";
    l1.href = "/img/favicon_" + title + ".ico";
    l1.rel  = "icon";
    h.appendChild(l1);
    l2 = document.createElement("link");
    l2.type = "image/x-icon";
    l2.href = "/img/favicon_" + title + ".ico";
    l2.rel  = "shortcut icon";
    h.appendChild(l2);
}

function setActiveStyleLogo(title) {
    var act, nact;
    act = "change page style";
    nact = "";

    if(document.all && !document.getElementById) {
	document.getElementById = function(id) {
	    return document.all[id];
	}
    }

    if (title == "default")
	document.getElementById("activeSty0").title = nact;
    else
  	document.getElementById("activeSty0").title = act;

    if (title == "alt1")
	document.getElementById("activeSty1").title = nact;
    else
  	document.getElementById("activeSty1").title = act;

    if (title == "alt2")
	document.getElementById("activeSty2").title = nact;
    else
  	document.getElementById("activeSty2").title = act;

    document.images["logoimg"].src = "/img/logo_" + title + ".png";
}

function setActiveStyleSheet(title) {
    var i, a, main;
    for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
	if(a.getAttribute("rel").indexOf("StyleSheet") != -1 && a.getAttribute("title")) {
	    a.disabled = true;
	    if(a.getAttribute("title") == title) a.disabled = false;
	}
    }
}

function getActiveStyleSheet() {
    var i, a;
    for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
	if(a.getAttribute("rel").indexOf("StyleSheet") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
    }
    return null;
}

function getPreferredStyleSheet() {
    var i, a;
    for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
	if(a.getAttribute("rel").indexOf("StyleSheet") != -1
	   && a.getAttribute("rel").indexOf("alt") == -1
	   && a.getAttribute("title")
	   ) return a.getAttribute("title");
    }
    return null;
}

function createCookie(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 = "";
    document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(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 validateStyleName(title) {
    if (title == "default") { return title; }
    if (title == "alt1") { return title; }
    if (title == "alt2") { return title; }
    return "default";
}

function fetchCookie() {
    var cookie = readCookie("StyleSheet");
    var title = validateStyleName( cookie ? cookie : getPreferredStyleSheet() );
    return title;
}

window.onload = function(e) {
    setActiveStyle( fetchCookie() );
}

window.onunload = function(e) {
    var title = getActiveStyleSheet();
    createCookie("StyleSheet", title, 365);
}

setActiveStyleSheet( fetchCookie() );