// ----------------------------------------------------------------------------
// Stylesheet functions from http://www.alistapart.com/articles/alternate/
// ----------------------------------------------------------------------------

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;
    }
  }
};

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

(function() {
	var cookie = readCookie("style");
	var title = cookie ? cookie : getPreferredStyleSheet();
	setActiveStyleSheet(title);
})();

// ----------------------------------------------------------------------------


(function() {
	
	var sitetools = document.getElementById('sitetools');
	var controls = {'big': null, 'default': null, 'highvis': null};
	var textsize = readCookie('textsize');
	
	if(sitetools) {
		sitetools.style.display = 'block';
		
		var i, el, key;
		for(i = 0; el = sitetools.getElementsByTagName('*')[i]; i++) {
			for(key in controls) {
				if((new RegExp('\\b'+key+'\\b')).test(el.className)) {
					controls[key] = el;
				}
			}
		}
		
		controls.highvis.onclick = function() {
			setActiveStyleSheet((getActiveStyleSheet() == 'Default') ? 'High Visibility' : 'Default');
			resizeText();
		};
		
		controls['big'].onclick = function() {
			textsize = 'large';
			resizeText();
		};
		
		controls['default'].onclick = function() {
			textsize = '';
			resizeText();
		};
	}
	
	function resizeText() {
		var large = (getActiveStyleSheet() == 'Default') ? '84.5%' : '130%';
		document.body.style.fontSize = (textsize == 'large') ? large : '';
		createCookie('textsize', textsize);
		if(controls['big'] && controls['default']) {
			controls['big'].style.display = (textsize == 'large') ? 'none' : '';
			controls['default'].style.display = (textsize == 'large') ? '' : 'none';
		}
	}

	resizeText();
	
})();