document.getElementById('menu_ostatni_sport').style.display = "none";
document.getElementById('menu_uzitecne_odkazy').style.display = "none";
document.getElementById('slideshow').style.display = "block";
document.getElementById('menu2').style.marginTop = "15px";
document.getElementById('menu3').style.marginTop = "5px";

function menu_switch(menuname) { 	
	if (document.getElementById('menu_' + menuname).style.display == "none") {
		document.getElementById('menu_' + menuname).style.display = "block";
		document.getElementById('head_' + menuname).style.fontWeight = "bold";
	} else {
		document.getElementById('menu_' + menuname).style.display = "none";
		document.getElementById('head_' + menuname).style.fontWeight = "normal";
	}
}