function add(data){
   document.getElementById('forum').sprava.value =
   document.getElementById('forum').sprava.value + data + "";
	document.formular.sprava.focus();
}
function number() {
  with (event)
  if (keyCode < 48 || keyCode > 57) returnValue=false;
}
function showHide(id){
	el=document.getElementById(id).style; 
	el.display=(el.display == 'block')?'none':'block';
}