NS4 = (document.layers) ? 1 : 0;
IE4 = (document.all) ? 1 : 0;
DOM = (document.getElementById) ? 1 : 0;
ver4 = (NS4 || IE4) ? 1 : 0;

var loaded = 0;
var gotlayers = 0;
var lastbutton='top';


function moveLayers() {
	if (gotlayers) {
		if (NS4) {
			scrWidth = window.innerWidth;
			scrHeight = window.innerHeight;
			document.layers['ofirmemenu'].left =  scrWidth / 2 - 387;
			document.layers['ofirmemenu'].top = 355;
			document.layers['osolimenu'].left =  scrWidth / 2 - 308;
			document.layers['osolimenu'].top = 355;
			document.layers['nabidkamenu'].left =  scrWidth / 2 - 162;
			document.layers['nabidkamenu'].top = 355;
			document.layers['produktymenu'].left =  scrWidth / 2 - 81
			document.layers['produktymenu'].top = 355;
			document.layers['vyzivamenu'].left =  scrWidth / 2 + 9;
			document.layers['vyzivamenu'].top = 355;
			document.layers['kontaktymenu'].left =  scrWidth / 2 + 89;
			document.layers['kontaktymenu'].top = 355;
			
		} else if (DOM) {
			scrWidth = (document.body.clientWidth ? document.body.clientWidth : window.innerWidth);
			scrHeight = (document.body.clientHeight ? document.body.clientHeight : window.innerHeight);
			document.getElementById('ofirmemenu').style.left = scrWidth / 2 - 387;
			document.getElementById('ofirmemenu').style.top = 355;
			document.getElementById('osolimenu').style.left = scrWidth / 2 - 308;
			document.getElementById('osolimenu').style.top = 355;
			document.getElementById('nabidkamenu').style.left = scrWidth / 2 - 162;
			document.getElementById('nabidkamenu').style.top = 355;
			document.getElementById('produktymenu').style.left = scrWidth / 2 - 81;
			document.getElementById('produktymenu').style.top = 355;
			document.getElementById('vyzivamenu').style.left = scrWidth / 2 + 9;
			document.getElementById('vyzivamenu').style.top = 355;
			document.getElementById('kontaktymenu').style.left = scrWidth / 2 + 89;
			document.getElementById('kontaktymenu').style.top = 355;
			       } else {
			scrWidth = document.body.clientWidth;
			scrHeight = document.body.clientHeight;
			document.all['ofirmemenu'].style.pixelLeft =  scrWidth / 2 - 387;
			document.all['ofirmemenu'].style.pixeltop = 355;
			document.all['osolimenu'].style.pixelLeft =  scrWidth / 2 - 308;
			document.all['osolimenu'].style.pixeltop = 355;
			document.all['nabidkamenu'].style.pixelLeft =  scrWidth / 2 - 162;
			document.all['nabidkamenu'].style.pixeltop = 355;
			document.all['produktymenu'].style.pixelLeft =  scrWidth / 2 - 81;
			document.all['produktymenu'].style.pixeltop = 355;
			document.all['vyzivamenu'].style.pixelLeft =  scrWidth / 2 + 9;
			document.all['vyzivamenu'].style.pixeltop = 355;
			document.all['kontaktymenu'].style.pixelLeft =  scrWidth / 2 + 89;
			document.all['kontaktymenu'].style.pixeltop = 355;
		}
	}
}

function popUp(menuName,on) {
	if (gotlayers) {
		if (on) {
			moveLayers();
			if (NS4) {
				document.layers[menuName].visibility = "show";
			} else if (DOM) {
				document.getElementById(menuName).style.visibility = "visible";
                        } else {
				document.all[menuName].style.visibility = "visible";
			}
		} else {
			if (NS4) {
				document.layers[menuName].visibility = "hide";
			} else if (DOM) {
				document.getElementById(menuName).style.visibility = "hidden";
			} else {
				document.all[menuName].style.visibility = "hidden";
			}
		}
	}
}
function zhasni() { 
 		if (gotlayers) {
			popUp('ofirmemenu',false);
			popUp('osolimenu',false);
			popUp('nabidkamenu',false);
			popUp('produktymenu',false);
			popUp('vyzivamenu',false);
			popUp('kontaktymenu',false);
			
	}
}