// JavaScript Document

  function tag(text) { 
   var textfield = document.getElementById('vzkaz'); 
    if (textfield.createTextRange && textfield.caretPos) { 
      var caretPos = textfield.caretPos; 
      caretPos.text =  caretPos.textarea.charAt(caretPos.text.length - 1) == ' ' ? text + ' ' : text; 
  } else textfield.value += text; 
  textfield.focus(caretPos) 
}

  function Kontrola(soucet) {
  var vysledek = document.getElementById('vysledek');
  if (vysledek.value == soucet) {
   return true;
  }
  else return false;  
  }
 
  function zobrazSkryj(idecko){
  el=document.getElementById(idecko).style; 
  el.display=(el.display == 'block')?'none':'block';
  }
  
  
function updateVideo(id)
{

  alert ("This is an alert message that can say whatever you want!");


}
</script>