var N   = (document.layers) ? true:false;                 // netscape 4
var IE   = (document.all) ? true:false;                    // ie4+
var DOM = ((document.getElementById)&&(!IE))?true:false;   // ns6 etc.
window.onresize=windowOnload;

function windowOnload()
{
 Schovejall();
}

function Zobraz(a) {
	nameMenu = "menu" + a;
 
	if (IE) {document.all[nameMenu].style.visibility = "visible";}
	if (N) {document[nameMenu].visibility = "visible";}
	if (DOM) {document.getElementById(nameMenu).style.visibility = "visible";}
}

function Schovejall() {
i = 0;
while(i<8) {
	i++;
	nameMenu = "menu" + i;
	if (IE) {document.all[nameMenu].style.visibility = "hidden";}
	if (N) {document[nameMenu].visibility = "hidden";}
	if (DOM) {document.getElementById(nameMenu).style.visibility = "hidden";}
} 
}

function Schovej(m) {

	nameMenu = "menu" + m;
	if (IE) {document.all[nameMenu].style.visibility = "hidden";}
	if (N) {document[nameMenu].visibility = "hidden";}
	if (DOM) {document.getElementById(nameMenu).style.visibility = "hidden";}
}

function Zobrazobr(a) {
  nameMenu = a;
   vyska = screen.height + "px";
    
	if (IE) 
  {
    document.all["divobrazekformat"].style.height = vyska;  
    document.all[nameMenu].style.visibility = "visible";
  }
	if (N)
  {
    document["divobrazekformat"].height = vyska; 
    document[nameMenu].visibility = "visible";
  }
	if (DOM) 
  {
    document.getElementById("divobrazekformat").style.height = vyska;
    document.getElementById(nameMenu).style.visibility = "visible";
  }
}

function Schovejobr(a) {

	nameMenu = a;
	if (IE) {document.all[nameMenu].style.visibility = "hidden";}
	if (N) {document[nameMenu].visibility = "hidden";}
	if (DOM) {document.getElementById(nameMenu).style.visibility = "hidden";}
}

function getObrazek(obr){
    document.getElementById("obrazek").src = obr;
}