function counterchar(znaku)
	{
	  	maxlen=znaku;

	  	F		= document.getElementById('filter');
		Text	= document.getElementById('text')
		
	  	ch_in = Text.value.length;
	  	ch_le = maxlen - ch_in;

	  if (ch_le<0)
	  {
		alert('Text je příliš dlouhý.');
		document.getElementById('text').value = document.getElementById('text').value.substring(0,maxlen);
		ch_in=maxlen;
		ch_le=0;
	  }

	  //F.char_in.value = ch_in;
	  F.char_le.value = ch_le;  
	}

function checked_all (form) {
  var select_all = document.getElementById("select_all").checked;
  var count_elements = form.elements.length;
  for (i=0;i < count_elements;i++) {
		if (form.elements[i].type == 'checkbox') {
			if (select_all) {
      form.elements[i].checked = true;
      } else {
      form.elements[i].checked = false;
      }
		}
	}
}

function newWin(el) {
	window.open(el.href); 
	return false;
}