try {
  document.execCommand("BackgroundImageCache", false, true);
} catch(err) {}

function fotka(jmeno,adr,x1,y1) {
	var url2 = '';
	if (adr) adr = adr+"/";
	url = "images/"+adr+jmeno;
	var x=typeof x1!="undefined" ? x1 : "648px"
	var y=typeof y1!="undefined" ? y1 : "480px"
	rozmery='width='+x+',height='+y+',toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no';
	okno = window.open('fotka.php','okno',rozmery);
	okno.moveTo(((screen.availWidth-x)/2),((screen.availHeight-y)/2));
}

function banner(x1,y1) {
	var x=typeof x1!="undefined" ? x1 : "648px"
	var y=typeof y1!="undefined" ? y1 : "480px"
	rozmery='width='+x+',height='+y+',toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes';
	okno = window.open('banner.php','banner',rozmery);
	okno.moveTo(((screen.availWidth-x)/2),((screen.availHeight-y)/2));
}

function rozbal(name){
	var div = document.getElementById(name);
	if(div.style.display == 'none'){
		div.style.display = 'block';
	} else {
		div.style.display = 'none';
	}
	return false;
}