function setHeight(obj,winObj){
  var plusConstant = 1; // add 10px ;)

  if(top.document.getElementById && !(winObj.document.all)) {
    h = top.document.getElementById(obj).contentDocument.body.scrollHeight + plusConstant;
    winObj.document.getElementById(obj).style.height = h+"px";
    winObj.document.getElementById(obj).style.visiblity='visible';
  }
  else if(top.document.all) {
    h = winObj.document.frames(obj).document.body.scrollHeight + plusConstant;
    winObj.document.all[obj].style.height = h+"px";
    winObj.document.all[obj].style.visiblity='visible';
  }
  return true;
}

function sendForm(_form)
{	
var sErr = "";
		
if (_form.text.value == "") sErr += "Pole pro zadani Vaseho vzkazu je prazdne!\n";

  if ((sErr =="")){
    _form.submit();
   }else{
    alert(sErr);
    return (this._form.text.focus())
  }
  return true;
}