function roll(id)
{
	e = document.getElementById(id);
	if(e.style.display == 'block') e.style.display = 'none';
	else e.style.display = 'block';
}
/*
function testImage(URL) {
    var tester=new Image();
    tester.onload=isGood;
    tester.onerror=isBad;
	tester.onabort=isBad;
	tester.src=URL;
}

function isGood() {
    alert('That image exists!');
}

function isBad() {
    alert('That image does no exist!');
}*/
function loadImages()
{
	pic = new Array();
	preload_image_object =[];
	images_loc = "gfx/";
	pic[0]=images_loc+"menu_aktualnosci_over.jpg"; 
	//testImage(pic[0]);
	pic[1]=images_loc+"menu_koncerty_over.jpg"; 
	pic[2]=images_loc+"menu_zespol_over.jpg"; 
	pic[3]=images_loc+"menu_download_over.jpg"; 
	pic[4]=images_loc+"menu_kontakt_over.jpg"; 
	pic[5]=images_loc+"menu_galeria_over.jpg"; 
	pic[6]=images_loc+"menu_plyty_over.jpg"; 
	for(i=0; i<pic.length; i++) 
	{
		 preload_image_object[i] = new Image();
		 preload_image_object[i].src = pic[i];
	}
}
function getHTML(url, holder, pars)
{		
	var myAjax = new Ajax.Updater(
		holder, 
		url, 
		{
			method: 'get', 
			parameters: pars,
			onLoad: document.getElementById(holder).innerHTML = '<center>Czekaj...</center>',
			onLoading: document.getElementById(holder).innerHTML = '<center>Czekaj...</center>',
		});
	
}