// JavaScript Document
function rozbal(nabidka) {
        var zmena = document.getElementById(nabidka).style;
        if(zmena.display == 'block') {
          zmena.display = 'none';
        }
        else {
          zmena.display = 'block';
        }
      }
	  

// preload images
var loaded = false;

function preload() {		
	pic1 = new Image();
	pic1.src = "images/nav_bg_over.gif";
	pic2 = new Image();
	pic2.src = "images/nav_left_bg_over.gif";
	pic3 = new Image();
	pic3.src = "images/nav_right_bg_over.gif";
	
	loaded = true;
}