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


function highlightPage() {
  var obr1 = new Image;
  obr1.src = "images/tlacitko.jpg";
  var obr2 = new Image;
  obr2.src = "images/tlacitko-inverz.jpg";
  
  if (!document.getElementById("menu")) return false;
  var nav = document.getElementById("menu");
  var links = nav.getElementsByTagName("a");
  for (var i=0; i<links.length; i++) {
    var linkurl = links[i].getAttribute("href");
    var currenturl = window.location.href;
    if (currenturl.indexOf(linkurl) != -1) {
      links[i].className = "tuto";
      
    }
    if (currenturl.indexOf("dom.php") != -1){
      if ((currenturl.indexOf("typ=1") != -1)&&(linkurl.indexOf("typ=1")!= -1)) {
        links[i].className = "tuto";
        
      }
      if ((currenturl.indexOf("typ=2") != -1)&&(linkurl.indexOf("typ=2")!= -1)) {
        links[i].className = "tuto";
        
      }
      if ((currenturl.indexOf("typ=3") != -1)&&(linkurl.indexOf("typ=3")!= -1)) {
        links[i].className = "tuto";
        
      }
    }
  }
}

function pripravaTabulky() {
  if (!document.getElementById("predcitanie")) return false;
  var priprava = document.getElementById("predcitanie");
  var obrazky = priprava.getElementsByTagName("img");
  var obr = new Array();
  for (var i=0; i<obrazky.length; i++) {    
    obr[i] = new Image; 
    link = obrazky[i].src.replace("s.jpg","m.jpg");
    obr[i].src = link;     
    obrazky[i].onmouseover = function() {
       
       
       this.src = this.src.replace("s.jpg","m.jpg"); 
            
    } 
    obrazky[i].onmouseout = function() {
       this.src = this.src.replace("m.jpg","s.jpg");       
    } 
  }
}

function priehladnyObr(){
  if (!document.getElementById("dom")) return false;
  if (!document.getElementById("obrazok2")) {
    var domvnutro = document.getElementById("domvnutro");    
    domvnutro.className = "vidim";
  }else{  
    var domvnutro = document.getElementById("domvnutro");
    domvnutro.className = "nevidim";
    var obrazok2 = document.getElementById("obrazok2");
    obrazok2.className = "vidim";
    obrazok2.onclick = function(){
      this.className = "nevidim"; 
      var domvnutro2 = document.getElementById("domvnutro");
      domvnutro2.className = "vidim";   
    }
  }    
}


addLoadEvent(highlightPage);
addLoadEvent(priehladnyObr);
addLoadEvent(pripravaTabulky);