/*function setCSS(cssname){
    setActiveStyleSheet(cssname);    
}*/

function lastMod()
{
	var lmod = new Date (document.lastModified);
	lmoddt = Date.parse(lmod)   // convert modified string to date
    if (lmoddt == 0){
        // date is unknown (or is January 1, 1970 GMT)
        return "Last Modified: Unknown";
    } else {
	    var lmodgmt = new Date(lmod.toGMTString());
	    year = takeYear(lmodgmt);
	    //year = lmodgmt.getFullYear();
	    month = lmodgmt.getMonth();
	    day = lmodgmt.getDate();
	    //lmod = new Date(Date.UTC(year, month, day, lmod.getHours(), lmodgmt.getMinutes(), lmodgmt.getSeconds(),lmodgmt.getMilliseconds()));
        lmod = new Date(year, month, day, lmod.getHours(), lmodgmt.getMinutes(), lmodgmt.getSeconds(),lmodgmt.getMilliseconds());
        return "Last Modified: " + lmod;
    }
}

function takeYear(theDate)
{
	x = theDate.getYear();
	var y = x % 100;
	y += (y < 38) ? 2000 : 1900;
	return y;
}


// All the following functions from Eric Meyer's www.meyerweb.com;
// these functions based on Paul Snowden's work described on A List Apart
//  <http://www.alistapart.com/stories/alternate/>

function setActiveStyleSheet(title) {
  var i, a, main;
  if (title) {
    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;
      }
    }
  }
}

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() {
  var i, a;
  for(i=0; (a = document.getElementsByTagName('link')[i]); i++) {
    if(a.getAttribute('rel').indexOf('style') != -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;
}

window.onload = function(e) {
  var cookie = readCookie('cubelogic.org_style');
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
}

window.onunload = function(e) {
  var title = getActiveStyleSheet();
  createCookie('cubelogic.org_style', title, 365);
}