if (document.images) {
var koncha1 = new Image() ; koncha1.src = "pics/koncha_1.gif";
var koncha2 = new Image() ; koncha2.src = "pics/koncha_2.gif";
var podgor1 = new Image() ; podgor1.src = "pics/podg_1.gif";
var podgor2 = new Image() ; podgor2.src = "pics/podg_2.gif";
var but1_1 = new Image() ; but1_1.src = "pics/blank.gif";
var but1_2 = new Image() ; but1_2.src = "pics/but_O2.gif";
var but2_2 = new Image() ; but2_2.src = "pics/but_O3.gif";
var histor1 = new Image() ; histor1.src = "pics/histor_1.gif";
var histor2 = new Image() ; histor2.src = "pics/histor_2.gif";
var ofis1 = new Image() ; ofis1.src = "pics/ofis_1.gif";
var ofis2 = new Image() ; ofis2.src = "pics/ofis_2.gif";
var projekt1 = new Image() ; projekt1.src = "pics/projekt_1.gif";
var projekt2 = new Image() ; projekt2.src = "pics/projekt_2.gif";
var virtur1 = new Image() ; virtur1.src = "pics/virtur_1.gif";
var virtur2 = new Image() ; virtur2.src = "pics/virtur_2.gif";
var mail1_1 = new Image() ; mail1_1.src = "pics/mail1_1.gif";
var mail1_2 = new Image() ; mail1_2.src = "pics/mail1_2.gif";
var mail2_1 = new Image() ; mail2_1.src = "pics/mail2_1.gif";
var mail2_2 = new Image() ; mail2_2.src = "pics/mail2_2.gif";

var logo1 = new Image() ; logo1.src = "pics/logo_small.gif";
var logo2 = new Image() ; logo2.src = "pics/logo_small2.gif";
}
function flipBtn(btnName, imgBtn) {
if (document.images){
document[btnName].src = eval(imgBtn + ".src");
}
return true;
}
function nothing(){
}
function hideIt(layer) {
    if (navigator.appName.substring(0,9) == "Microsoft"){
        document.all[layer].style.visibility="hidden";
    }else{
        document.layers[layer].visibility="hide";
    }
}
function showIt(layer) {
    if (navigator.appName.substring(0,9) == "Microsoft"){
        document.all[layer].style.visibility="visible";
    }else{
        document.layers[layer].visibility="show";
    }
}