function vymaz_pole()
{
   if (document.getElementById('ff2').nazev.value == 'ENTER') { document.getElementById('ff2').nazev.value = '';}
   if (document.getElementById('ff2').vydanood.value == 'FROM') { document.getElementById('ff2').vydanood.value = '';}
   if (document.getElementById('ff2').vydanodo.value == 'TO') { document.getElementById('ff2').vydanodo.value = '';}
   if (document.getElementById('ff2').cislo.value == 'ENTER') { document.getElementById('ff2').cislo.value = '';}


    return true;	

}