function help_navigacia() {

	asirka = 499; //screen.availWidth;
	avyska = screen.availHeight * 0.92;
	x = screen.width - asirka * 1.02
	y = 0; // screen.height * 0.15;
	
	window.open("/help.php", "", "left="+x+",top="+y+",width="+asirka+",height="+avyska+",scrollbars=yes,resizable=yes");
}
// ----------------
// zobrazi velke foto v schovanom DIV-e
function show(cesta, akcia, left) {
	var obj
	// vypocet horneho alebo laveho odsadenia od okraja lightboxu
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();
	var lightboxTop = arrayPageScroll[1] + (arrayPageSize[3] / 3.8);
	var lightboxLeft = arrayPageScroll[0];
	
	if (akcia == 1) {
		obj = document.getElementById('foto_velke_obal')
		obj.style.top = lightboxTop + 'px';
		obj.style.display = 'block';
		obj = document.getElementById('foto_velke')
		obj.style.top = (lightboxTop+13) + 'px';
		obj.style.display = 'block';
		obj = document.getElementById('img')
		obj.style.top = (lightboxTop+13) + 'px';
		obj.style.left = (lightboxLeft+left) + 'px';
		obj.style.display = 'block';
		obj.src = cesta;

	} else {
		obj = document.getElementById('foto_velke_obal')
		obj.style.display = 'none'
		obj = document.getElementById('foto_velke')
		obj.style.display = 'none'
		obj = document.getElementById('img')
		obj.style.display = 'none'
	}
}
// funkcia na otvaranie liniek odkazujucich na externu stranku do noveho okna
// osetrenie v standarde XHTML navalidneho tagu target="_blank"
function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.getAttribute("href") &&
       anchor.getAttribute("rel") == "externe")
     anchor.target = "_blank";
 }
}
window.onload = externalLinks;