function swtch(obrazek, imgname) {
    document[imgname].src = "img/submenu/"+obrazek+".gif";
}


function swtchsub(obrazek, imgname) {
    document[imgname].src = "img/submenicko/"+obrazek+".gif";
}




  function tucne(id,id2)
  {
	document.getElementById(id).style.fontWeight = 'bold';
	document.getElementById(id2).style.fontWeight = 'bold';

  }     
  
  function normalne(id,id2)
  {
	document.getElementById(id).style.fontWeight = 'normal';
	document.getElementById(id2).style.fontWeight = 'normal';
  }