/**xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 	
X	Funkce pro zvetsovani a zmensovani fontu idtagu "content"
X	V body onload se musi volat funkce initVelikostFontu() ktera zjisti jestli jiz existuje 
X	ulozene cookie a kdyz ne tak ho vytvori a nastavi defaultni velikost na 100%
X	Pro zvetseni zmenseni a nastaveni normalu jsou funkce davane do onClick
X	zmensiFont(), zvetsiFont(), normalFont()
X	8.7.2008 Pavel Štolba
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx */

//nastaveni promennych

//defaultni velikost fontu
var size=100; 
//jednotky
var jednotky='%';
//velikost kroku zmeny
var krok=10;
//max velikost fontu
var max=160;
//min velikost fontu
var min=60;
//nazev cookie
var cookiename="cnczfontsize";
//trvanlivost cookie
var cookiedni=180;
var idtag="content";

//XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

function initVelikostFontu() {
	if (!getCookie(cookiename)){
		size=100;
		setCookie(cookiename,size,cookiedni);
	}
	else{
		size=getCookie(cookiename);
		document.getElementById(idtag).style.fontSize=size+jednotky;
	}
}

function zvetsiFont(){
	
	size = (parseInt(size)+krok>max) ? max : parseInt(size) + krok;
	document.getElementById(idtag).style.fontSize=size+jednotky;
	setCookie(cookiename,size,cookiedni);
}

function zmensiFont(){

	size = (parseInt(size)-krok<min) ? min : parseInt(size)-krok;
	document.getElementById(idtag).style.fontSize=size+jednotky;
	setCookie(cookiename,size,cookiedni);
}

function normalFont(){
	size=100;
	document.getElementById(idtag).style.fontSize=size+jednotky;
	setCookie(cookiename,size,cookiedni);
}

// Modified from Bill Dortch's Cookie Functions (hidaho.com) 
// (found in JavaScript Bible)
function setCookie(name,value,days,path,domain,secure) {
  var expires, date;
  if (typeof days == "number") {
    date = new Date();
    date.setTime( date.getTime() + (days*24*60*60*1000) );
		expires = date.toGMTString();
  }
  document.cookie = name + "=" + escape(value) +
    ((expires) ? "; expires=" + expires : "") +
    ((path) ? "; path=" + path : "") +
    ((domain) ? "; domain=" + domain : "") +
    ((secure) ? "; secure" : "");
}

// Modified from Jesse Chisholm or Scott Andrew Lepera ?
// (found at both www.dansteinman.com/dynapi/ and www.scottandrew.com/junkyard/js/)
function getCookie(name) {
  var nameq = name + "=";
  var c_ar = document.cookie.split(';');
  for (var i=0; i<c_ar.length; i++) {
    var c = c_ar[i];
    while (c.charAt(0)==' ') c = c.substring(1,c.length);
    if (c.indexOf(nameq) == 0) return unescape( c.substring(nameq.length, c.length) );
  }
  return null;
}

// from Bill Dortch's Cookie Functions (hidaho.com) 
function deleteCookie(name,path,domain) {
  if (getCookie(name)) {
    document.cookie = name + "=" +
      ((path) ? "; path=" + path : "") +
      ((domain) ? "; domain=" + domain : "") +
      "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
}