/**
 *  JS funkce
 */

  function change_image(element,url,filename,subdir)
  {
    element.src=url+subdir+filename;  
  }

  function change_class(element,newclass)
  {
    element.className= newclass;
  }  
  
  /*
 *  @description Overi jestli je email validni
 *  @param string m
 *  @return bool
 */
  function check_validEmail(m){
  var mail = "^[_a-zA-Z0-9\.\-]+@[_a-zA-Z0-9\.\-]+[\.]{1}[a-zA-Z]{2,4}$";
  return (m.match(mail)) ? true : false;
}


  function change_zobraz_div(id)
  {
    if(document.getElementById(id))
    {
      if(document.getElementById(id).style.display == "block")
      {
        skryj_div(id);
      }else
      {
         zobraz_div(id);
      }

    }
  }
  
  function skryj_div(id)
  {
    if( document.getElementById(id))
    {
      document.getElementById(id).style.display='none';
    }
  }

  function zobraz_div(id)
  {
    if( document.getElementById(id))
    {
      document.getElementById(id).style.display='block';
    }
  }
  

 
  function show_hide(id)
  {
    var dok = document.getElementById(id);
    if(dok)
    {
      if(dok.style.display == "block")
      {
        dok.style.display="none";
      }
      else
      {
        dok.style.display="block";
      }
    }
  }
  
  
  function show_submenu(id)
  {
      var element = document.getElementById("submenu_item_"+id);
      if(element)
      {
          element.style.display = "block";
      }
  }
  
  function hide_submenu(id)
  {
      var element = document.getElementById("submenu_item_"+id);
      if(element)
      {
          element.style.display = "none";
      }
  }
  
  function nizoral_on(){
    document.getElementById('banner').innerHTML='<img src="images/nizoral.gif" alt="Zavřít" style="position:absolute; top:0px; left:0px; cursor:hand;"  onclick="nizoral_off();" />';  
  }
  
  function nizoral_off(){
    document.getElementById('banner').innerHTML='';  
  }
  
  function mapa_on(){
    document.getElementById('banner').innerHTML='<img src="images/mapa.gif" alt="Zavřít" style="position:absolute; top:250px; left:61px; cursor:hand; border:2px solid #f1ac6f;"  onclick="mapa_off();" />';  
  }
  function mapa_off(){
    document.getElementById('banner').innerHTML='';  
  }


  function napoveda(key){

    var left=document.getElementById('main_holder').offsetLeft+192;
    window.open('slovnik.html#'+key,'Slovník','toolbar=0,location=0,status=0,menubar=0,scrollbars=1,resizable=0,width=600,height=200, left='+left+', top=300');
  
  
  }