function checkNewsletterForm(action) {
  var emailRegexp = /^(([A-Za-z0-9]+_+)|([A-Za-z0-9]+\-+)|([A-Za-z0-9]+\.+)|([A-Za-z0-9]+\++))*[A-Za-z0-9]+@((\w+\-+)|(\w+\.))*\w{1,63}\.[a-zA-Z]{2,6}$/i; 
  input = document.getElementById('left_e');
  if (input.value == '' || input.value == '@') {
    alert('Nevyplnili jste email.');
    return false;
  }
  if (!emailRegexp.test(input.value)) {
    alert('Zadaný email je ve špatném formátu.');
    return false;
  }
  !pageTracker._trackPageview(action);
  return true;
}


// Zmizeni textu pri najeti na vyhledavaci polozku a zmena stylu

function input_focus(object, label) {
	if (object.value == label) {
		object.value= ''; 
	}
	return true;
}

function input_blur(object, label) {
	if (object.value == '') {
		object.value= label; 
	}
	return true;
}

/* zmeny formatovani formularovych prvku v zavislosti na udalostech pro MSIE <= 6 */
/* vyzaduje prislusne definice v CSS !!! */
	var itemfocus = new Array();

	function borderFocus(id)
	{
		element = document.getElementById(id);
		element.className = 'borderFocus';
		
		itemfocus[id] = true;
	}
		
	function borderBlur(id)
	{
		itemfocus[id] = false;
		borderOut(id);	
	}
	
	function borderOver(id)
	{
		if(!itemfocus[id])
		{
			element = document.getElementById(id);
			element.className = 'borderOver';
		}
	}
		
	function borderOut(id)
	{
		if(!itemfocus[id])
		{
			element = document.getElementById(id);
			element.className = 'borderOut';
		}
	}