function switchLinks(){
	if( (!document.getElementById("textsize_regular")) ||  (!document.getElementById("textsize_larger")) || (!document.getElementById("textsize_largest"))){return false}
								
	var swlink1=document.getElementById("textsize_regular");
	var swlink2=document.getElementById("textsize_larger");
	var swlink3=document.getElementById("textsize_largest");
	
	swlink1.onclick= function(){
		setActiveStyleSheet("default");
		return false;
	}
	
	swlink2.onclick= function(){
		setActiveStyleSheet("large_text");
		return false;
	}
	
	swlink3.onclick= function(){
		setActiveStyleSheet("largest_text");
		return false;
	}
	
}

function switchLinksAccessibility(){
	if( (!document.getElementById("accessibility_textsize_regular")) ||  (!document.getElementById("accessibility_textsize_larger")) || (!document.getElementById("accessibility_textsize_largest"))){return false}
								
	var swlink4=document.getElementById("accessibility_textsize_regular");
	var swlink5=document.getElementById("accessibility_textsize_larger");
	var swlink6=document.getElementById("accessibility_textsize_largest");
	
	swlink4.onclick= function(){
		setActiveStyleSheet("default");
		return false;
	}
	
	swlink5.onclick= function(){
		setActiveStyleSheet("large_text");
		return false;
	}
	
	swlink6.onclick= function(){
		setActiveStyleSheet("largest_text");
		return false;
	}
}

function showSizeLinks(){
	if( (!document.getElementById("accessibility_size_links")))
		{return false}
	else
		{
		if( document.getElementById("accessibility_size_links").style.display == '')
			{
			document.getElementById("accessibility_size_links").style.display='block';
			}	
		}
}



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

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

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

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

}


addLoadEvent(switchLinks);
addLoadEvent(switchLinksAccessibility);
addLoadEvent(showSizeLinks);