function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}

addLoadEvent(function() {
	// activate style switcher
	var cookie = readCookie("style");
	if (document.getElementsByTagName) {
		var title = cookie ? cookie : getPreferredStyleSheet();
		setActiveStyleSheet(title);
		fontSizer(0);
	}
});

// style switcher
function setActiveStyleSheet(title) {
	if (document.getElementsByTagName) {
		var i, a, main;
		for (i=0; (a = document.getElementsByTagName("link")[i]); i++) {
			if (a.getAttribute("rel") &&
			a.getAttribute("rel").indexOf("style") != -1 &&
			a.getAttribute("title")) {
				a.disabled = true;
				if(a.getAttribute("title") == title) a.disabled = false;
			}
		}
		createCookie("style", title, 365);
	} else {
		notSupported();
	}
}
function getActiveStyleSheet() {
	var i, a;
	for (i=0; (a = document.getElementsByTagName("link")[i]); i++) {
		if (a.getAttribute("rel") &&
		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") &&
		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;
}

function fontSizer(adj) {
	if (document.getElementById) {
		iInit = readCookie('fontSize');
		if (adj != 'reset') {
			if (isNaN(iInit) || iInit == null) {
				i = 0 + adj;
			} else {
				i = parseInt(iInit) + adj;
			}
			if (i > 16) {
				i = 5;
				alert("The text size cannot be increased any further.");
			}
			if (i < -5) {
				i = -5;
				alert("The text size cannot be decreased any further.");
			}
		} else {
			i = 0;
		}
		b = document.getElementById('content');
		if (b)
		{
			b.style.fontSize =  100 + (i * 10) + '%';
			b.style.lineHeight = 160 + (i * 5) + '%'; 
		}
		c = createCookie('fontSize',i,365);
		return b;
	} else {
		notSupported();
	}
}