var zaloha = "";

function clearInput ( id ) {
 if ( id == "fulltxt" && document.getElementById(id).value != "zadejte hledaný výraz" ) {
  document.getElementById(id).select();
  return;
 }
 zaloha = document.getElementById(id).value;
 document.getElementById(id).value = "";
}

function checkInput ( id ) {
 if ( document.getElementById(id).value == "" ) {
  document.getElementById(id).value = zaloha;
 }
}

function checkPosta ( ) {
 if ( document.getElementById('dodani').value == 1 ) {
  document.getElementById('posta').innerHTML = "";
  document.getElementById('posta').style.height = "0px";
  document.getElementById('posta').style.padding = "0px";
 } else {
  document.getElementById('posta').innerHTML = "+ poštovné dle ceníku České pošty";
  document.getElementById('posta').style.height = "13px";
  document.getElementById('posta').style.padding = "5px";
 }
}

function checkValues ( ) {
 if ( document.getElementById("c_name").value == "" ) {
  document.getElementById("c_name").style.border = "2px solid red";
  alert("Vyplňte Vaše jméno.");
  document.getElementById("c_name").focus();
  return false;
 }
 if ( document.getElementById("c_kontakt").value.length < 5 ) {
  document.getElementById("c_kontakt").style.border = "2px solid red";
  alert("Vyplňte kontaktní email nebo telefon.");
  document.getElementById("c_kontakt").focus();
  return false;
 }
 if ( document.getElementById("c_question").value == "" ) {
  document.getElementById("c_question").style.border = "2px solid red";
  alert("Zadejte Váš dotaz.");
  document.getElementById("c_question").focus();
  return false;
 }
 return true;
}

function fxBlink ( ) {
 var show = new Fx.Tween("kosik");
  show.start('background-color', '#ffffff', '#ff0000');
  show.addEvent('complete', function() {
   new Fx.Tween("kosik").start('background-color', '#ff0000', '#ffffff');
  });
 return false;
}

function fxscroll ( ) {
 var slide = new Fx.Scroll(window);
 slide.toElement("c_form");
 slide.addEvent('complete', function() {
    var show = new Fx.Tween("c_form");
    show.start('background-color', '#ffffff', '#ff0000');
    show.addEvent('complete', function() {
     new Fx.Tween("c_form").start('background-color', '#ff0000', '#ffffff');
  });
 });
 document.getElementById("c_name").focus();
 return false;
}