function winH() {
 if (window.innerHeight) return window.innerHeight;
 else if (document.documentElement && document.documentElement.clientHeight)
  return document.documentElement.clientHeight;
 else if (document.body && document.body.clientHeight)
  return document.body.clientHeight;
 else return null;}
function winW() {
 if (window.innerWidth) return window.innerWidth;
 else if (document.documentElement && document.documentElement.clientWidth)
  return document.documentElement.clientWidth;
 else if (document.body && document.body.clientWidth)
  return document.body.clientWidth;
 else return null;}
function vyska() {
 document.getElementById('text').style.height=(winH()-250).toString()+'px';
 document.getElementById('aktuality').style.height=(winH()-300).toString()+'px';
 if (winH()>500) {document.getElementById('sponzori').style.top=(winH()-190).toString()+'px';};
}
function skryj(a)
{
 document.getElementById('prvni').style.display='none';
 document.getElementById('druhy').style.display='none';
 document.getElementById('treti').style.display='none';
 document.getElementById('ctvrty').style.display='none';
 document.getElementById(a).style.display='block';
}
function tlacitko1(a) {
 a.style.backgroundColor='#ff2211';
 a.style.fontWeight='bold';
}
function tlacitko2(a) {
 a.style.backgroundColor='#cc2200';
 a.style.fontWeight='normal';
}