var ns4 = (document.layers)? true:false;
var ns6 = (document.getElementById)? true:false;
var ie4 = (document.all)? true:false;

function getObject(obj) {
    if (document.getElementById) {
        return document.getElementById(obj);
    } else if (document.all) {
        return document.all[obj];
    } else if (document.layers) {
        return document.layers[obj];
    }
}

function ShowMenu(obj) {
    menut = getObject(obj);
    menut.style.visibility = "visible";
}

function HideMenu(obj) {
    menut = getObject(obj);
    menut.style.visibility = "hidden";
}

img1=new Image();
img1.src="images/uvod/uvod0.jpg";
img2=new Image();
img2.src="images/uvod/uvod1.jpg";
img3=new Image();
img3.src="images/uvod/logm.jpg";
img4=new Image();
img4.src="images/uvod/zamestnani1.jpg";
img5=new Image();
img5.src="images/uvod/profil1.jpg";
img6=new Image();
img6.src="images/uvod/mapka1.jpg";