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=/";
  document.cookie = "styleNum="+styleNum+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 addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}

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

/*
window.onload = function(e) {
  var cookie = readCookie("style");
  var title = cookie ? cookie : getPreferredStyleSheet();
  setActiveStyleSheet(title);
  
  styleNum = Number(readCookie("styleNum"));
  alert(styleNum);
}
*/

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

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

 styleNum = readCookie("styleNum");
 
 //for the increase and decrease
 var fontSizeArray = new Array();
	
	fontSizeArray[0] = 'normal';
	fontSizeArray[1] = 'larger';
	fontSizeArray[2] = 'largest';
	
	var styleNum = 0;
	
	function fnSetStyle(whichDir) {
		var direction = whichDir.className;
		/*alert(direction);*/
		if (direction == 'increase') {
			//increase
			if (styleNum < 2) {
				styleNum += 1;
				setActiveStyleSheet(fontSizeArray[styleNum]);
			}
		} else {
			//decrease
			if(styleNum > 0) {
				styleNum -= 1;
				setActiveStyleSheet(fontSizeArray[styleNum]);
			}
		}				return false;
	}
	
	function prepareLinks(){
		if (!document.getElementById) return false; //if it isn't capable of getting els by id, then stop
		if (!document.getElementsByTagName) return false; //if it isn't capable of getting els by tag name, then stop
		if (!document.getElementById("font_control")) return false; //if font_control doesn't exist, then stop
		//ok go
		var targetEl = document.getElementById("font_control");
		var targetLinks = targetEl.getElementsByTagName("a");
		
		for(i=0; i<targetLinks.length; i++){
			targetLinks[i].onclick = function() {
				return fnSetStyle(this)
			}
		}
	}
	
	addLoadEvent(prepareLinks);