var g_startcolor = '';
var g_endcolor = '';
var bright_startcolor = '';
var bright_endcolor = '';


/* switches between css styles (preferred and alternate) */

/* sets the active stylesheet */
function setActiveStyleSheet(title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
      a.disabled = true;
      if(a.getAttribute("title") == title) a.disabled = false;
    }
  }
  createCookie("style", title, 365);
  if (title == 'black') {
  	$$("img.page-color-sensitive").each(function(img)
  	{
  		img.src = img.src.replace(/_light\.gif$/i,".gif");
  	});
    g_startcolor = '#474747';
    g_endcolor = '#2D2D2D';
    bright_startcolor = '#6F6F6F';
    bright_endcolor = '#2D2D2D';
    alexaholic_bg = '2D2D2D';
  } else { 
  	$$("img.page-color-sensitive").each(function(img)
  	{
  		if (!img.src.match(/_light\.gif$/i))
  		{
  			img.src = img.src.replace(/\.gif$/i,"_light.gif");
  		}
  	});
    g_startcolor = '#E8E8E8';
    g_endcolor = '#FFFFFF';
    bright_startcolor = '#C4C4C4';
    bright_endcolor = '#FFFFFF';
    alexaholic_bg = 'FFFFFF';
  }
}


/* fetches the active stylesheet (used to set the cookie when the user unloads) */
function getActiveStyleSheet() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
  }
  return null;
}

function getPreferredStyleSheet() {
  return 'white';
}

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;
}

/* onload, read in the user's preferred stylesheet from the cookie, or choose the default preferred */
document.setupStyleSheet = function (e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}
Event.observe(window,"load",document.setupStyleSheet.bindAsEventListener());


/* first time loading, need to set the style to the preferred 
 * since this is loaded after the default preferred stylesheet is loaded
 */
var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);