function validate(formular)
{
  if (formular.jmeno.value=="")
        {
         alert("Musíte zadat Jméno!");
         formular.jmeno.focus();
         return false;
        }

  if (formular.zprava.value=="")
        {
         alert("Musíte zadat text zprávy!");
         formular.zprava.focus();
         return false;
        }

    if (formular.email.value!="")
        {
        if (window.RegExp)
        {
         re = new RegExp("^[^@]+@[^.]+\..+$");
         if (!re.test(formular.email.value))
         {
          alert("Zadaný email není správný !");
          formular.email.focus();
          return false;
         }
    }
    }
  if (formular.kontrola.value=="")
        {
         alert("Opište prosím písmena z obrázku!");
         formular.kontrola.focus();
         return false;
        }
  else
  return true;
}

function smajliky(what)
{
    //document.ff.zprava.value = document.ff.zprava.value + ' ' + what + ' ';
  //document.ff.zprava.focus();
  insertTag (document.ff.zprava,what);
}

// IE only - wraps selected text with lft and rgt
  function WrapIE(lft, rgt) {
    strSelection = document.selection.createRange().text;
    if (strSelection!="") {
      document.selection.createRange().text = lft + strSelection + rgt;
    }
  }

// Moz only - wraps selected text with lft and rgt
  function wrapMoz(txtarea, lft, rgt) {
    var selLength = txtarea.textLength;
    var selStart = txtarea.selectionStart;
    var selEnd = txtarea.selectionEnd;
    if (selEnd==1 || selEnd==2) selEnd=selLength;
    var s1 = (txtarea.value).substring(0,selStart);
    var s2 = (txtarea.value).substring(selStart, selEnd)
    var s3 = (txtarea.value).substring(selEnd, selLength);
    txtarea.value = s1 + lft + s2 + rgt + s3;
  }

// Chooses technique based on browser
  function wrapTag(txtarea, lft, rgt) {
    lft = unescape(lft);
    rgt = unescape(rgt);
    if (document.all) {
      WrapIE(lft, rgt);
    }
    else if (document.getElementById) {
      wrapMoz(txtarea, lft, rgt);
    }
  }

// IE only - Insert text at caret position or at start of selected text
  function insertIE (txtarea, text) {
    if (txtarea.createTextRange && txtarea.caretPos) {
      var caretPos = txtarea.caretPos;
      caretPos.text = caretPos.text.charAt(caretPos.text.length - 1) == ' ' ? text+caretPos.text + ' ' : text+caretPos.text;
    } else {
      txtarea.value = txtarea.value + text;
    }
    return;
  }

// Moz only - Insert text at caret position or at start of selected text
  function insertMoz(txtarea , lft) {
    var rgt="";
    wrapTag(txtarea, lft, rgt);
    return;
  }

// Switch function based on browser - Insert text at caret position or at start of selected text
  function insertTag(txtarea , lft) {
    if (document.all) {
      insertIE(txtarea, lft);
    }
    else if (document.getElementById) {
      insertMoz(txtarea, lft);
    }
  }