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 readCookieAccessibilita()
{
	var cookie = readCookie("accessibilita");
	
	if(cookie=="off")
	{
		
		changeAllElemento(2);
	
		setActiveStyleSheet('fontcolor','fontcolor::off');
	}
	
	if(cookie=="on")
	{
		setActiveStyleSheet('fontcolor','fontcolor::on');
	}
	
	
}

		
  
function setAccessibilita(status){
	createCookie("accessibilita", status, 365);
	if(status=="off")
	{	
		changeAllElemento(2);
		setActiveStyleSheet('fontcolor','fontcolor::off');
	}
	
	if(status=="on")
	{
		createCookie("icpfontsize", 0, 365);
		window.location.reload();
		setActiveStyleSheet('fontcolor','fontcolor::on');
		
	}

}

function changeBckColorAndColor(element){
	element.style.backgroundColor = '#000000';
	element.style.color = '#FFFFFF';	
}

function cambiaFontSize(increment)
{
	if(increment != null)
	{
		var incremento = getFontSizeIncrement(increment);
		
		changeAllElementFontSize(incremento);
	}
	
}

function getFontSizeIncrement(increment)
{
	var cookie = readCookie("icpfontsize");
	
	var max= 4;
	var min= -4;
	
	if(cookie != null && cookie != "")
	{
		var incremento = parseInt(cookie);
		var newIncremento = parseInt(incremento) + parseInt(increment);
		if(newIncremento <= max && newIncremento >= min)
		{
			createCookie("icpfontsize", newIncremento, 365);
		}
		else
		{
			createCookie("icpfontsize", incremento, 365);
			increment = 0;
		}
	}
	else
	{
		createCookie("icpfontsize", increment, 365);
	}
	
	return increment;

  
	
}

function increaseFont(element, increment)
{

	var cssFontSize	= getCSSStyle(element, "font-size");
	var elementFontSize = element.style.fontSize;
	
	var newFontSize = "";
	
	if(elementFontSize != null | cssFontSize != null )
	{
	
			if(cssFontSize != "")
			{
				newFontSize = cssFontSize;
			}
			
			
			if(elementFontSize != "")
			{
				newFontSize = elementFontSize;
			}
			
			var lunghezza = newFontSize.length;
			
			var extractUnita = newFontSize.substr(lunghezza-1,1);
			
			if(extractUnita != "%")
			{
			
				extractUnita = newFontSize.substr(lunghezza-2,2);
				
				var unita="";
				
				if(extractUnita == "em")
				{
					unita = "em";
				}
				
				if(extractUnita == "ex")
				{
					unita = "ex";
				}
				
				if(extractUnita == "px")
				{
					unita = "px";
				}
				
				if(unita != "")
				{
					var size = parseInt(newFontSize.replace(unita,""));

					var newSize = parseInt(size) +parseInt(increment);
					element.style.fontSize = newSize+unita;
				}
			}		
	}
}

function changeAllElement()
{
	changeAllElemento(0);
}

function changeAllElemento(inc)
{
	
	var element = "body,div,span,table,td,tr,h2,h3,a,li,ul,form,p";
	var arrayElement = element.split(",");
	
	for(i=0; i < arrayElement.length ; i++)
	{
		var arrayOfElement = document.getElementsByTagName(arrayElement[i]);
		
		for(x=0; x < arrayOfElement.length ; x++)
		{
			changeBckColorAndColor(arrayOfElement[x]);
			increaseFont(arrayOfElement[x], inc);
		}
	}
	
	
}

function changeAllElementFontSize(incremento)
{

	var element = "body,div,span,table,td,tr,h2,h3,a,li,ul,form,p";
	var arrayElement = element.split(",");
	
	for(i=0; i < arrayElement.length ; i++)
	{
		var arrayOfElement = document.getElementsByTagName(arrayElement[i]);
		
		for(x=0; x < arrayOfElement.length ; x++)
		{
			increaseFont(arrayOfElement[x], incremento)
		}
	}
}



// ---- Default
function setActiveStyleSheet(objclass,title) {
  var i, a, main;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(	a.getAttribute("rel").indexOf("style") != -1 && 
    		(a.getAttribute("title")!=null && a.getAttribute("title").indexOf(objclass) != -1)) {
      a.disabled = true;
      if(a.getAttribute("title") == title) {
      		a.disabled = false;
      		// alert("ok: "+objclass+"::"+title);
      	}
    }
  }
}

function getActiveStyleSheet(objclass) {
  var i, a;
  for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
    if(	a.getAttribute("rel").indexOf("style") != -1 && 
    		(a.getAttribute("title")!=null && a.getAttribute("title").indexOf(objclass) != -1) &&
    		!a.disabled) 
    		return a.getAttribute("title");
  }
  return null;
}

function getPreferredStyleSheet(objclass) {
  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")!=null && a.getAttribute("title").indexOf(objclass) != -1)
       ) 
       return a.getAttribute("title");
  }
  return null;
}


window.onload = function(e) {

	setPreferredDef();
	
 
}

function setLinkTitle()
{
	var arrayOfLink = document.getElementsByTagName("link");
	
	for( i=0; i< arrayOfLink.length ; i++)
	{
		var link = arrayOfLink[i];
		
		if(	link.getAttribute("title")==null &&  link.getAttribute("type")!=null ) {
			if(link.getAttribute("type") == "text/css" )
			{
				link.setAttribute("title","fontcolor::on");
			}
		}
	}
}

function setPreferredDef()
{
	setLinkTitle();
  var cookie = readCookie("stylescreen");
  var title = cookie ? cookie : getPreferredStyleSheet("screen");
  setActiveStyleSheet("screen",title);
  
  cookie = readCookie("stylefont");
  title = cookie ? cookie : getPreferredStyleSheet("font");
  setActiveStyleSheet("font",title);  

  cookie = readCookie("stylecolor");
  title = cookie ? cookie : getPreferredStyleSheet("color");
  setActiveStyleSheet("color",title);  
  
  cookie = readCookie("stylefontcolor");
  title = cookie ? cookie : getPreferredStyleSheet("fontcolor");
  setActiveStyleSheet("fontcolor",title);  
  
  var cookie = readCookie("icpfontsize");
  
  if(cookie != null && cookie != "")
  {
	changeAllElementFontSize(cookie);
  }
  else
  {
	createCookie("icpfontsize", 0, 365);
	changeAllElementFontSize(0);
  }
  
  readCookieAccessibilita();

}


window.onunload = function(e) {
  var title = getActiveStyleSheet("screen");
  createCookie("stylescreen", title, 365);
  
  title = getActiveStyleSheet("font");
  createCookie("stylefont", title, 365);
  
  title = getActiveStyleSheet("color");
  createCookie("stylecolor", title, 365);
  
  title = getActiveStyleSheet("fontcolor");
  createCookie("stylefontcolor", title, 365);
  
  }
  
  function getCSSStyle(oElm, strCssRule){
	var strValue = "";
	if(document.defaultView && document.defaultView.getComputedStyle){
		strValue = document.defaultView.getComputedStyle(oElm, "").getPropertyValue(strCssRule);
	}
	else if(oElm.currentStyle){
		strCssRule = strCssRule.replace(/\-(\w)/g, function (strMatch, p1){
			return p1.toUpperCase();
		});
		strValue = oElm.currentStyle[strCssRule];
	}
	return strValue;
}