// JavaScript Document
userAgent = window.navigator.userAgent;
browserVers = parseInt(userAgent.charAt(userAgent.indexOf("/")+1),10);
function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function findElement(n,ly) {
	if (browserVers < 4)		return document[n];
	var curDoc = ly ? ly.document : document;
	var elem = curDoc[n];
	if (!elem) {
		for (var i=0;i<curDoc.layers.length;i++) {
			elem = findElement(n,curDoc.layers[i]);
			if (elem) return elem;
		}
	}
	return elem;
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		var img;
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			img = null;
			if (document.layers) {
				img = findElement(changeImages.arguments[i],0);
			}
			else {
				img = document.images[changeImages.arguments[i]];
			}
			if (img) {
				img.src = changeImages.arguments[i+1];
			}
		}
	}
}

var preloadFlag = false;

function preloadImagesPrih() {
	if (document.images) {
		prihlaska_icons_home_over = newImage("img/prihlaska_home_over.jpg");
		prihlaska_icons_prihlaskaPDF_over = newImage("img/prihlaska_prihlaskaPDF_over.jpg");
		prihlaska_icons_online_over = newImage("img/prihlaska_online_over.jpg");
		preloadFlag = true;
	}
}

function preloadImagesInfo() {
	if (document.images) {
		info_icons_home_over = newImage("img/info_home_over.jpg");
		info_icons_o_festivalu_over = newImage("img/info_o-festivalu_over.jpg");
		info_icons_Mikulov_over = newImage("img/info_Mikulov_over.jpg");
		info_icons_mapa_over = newImage("img/info_mapa_over.jpg");
		info_icons_ubytovani_over = newImage("img/info_ubytovani_over.jpg");
		info_icons_doprava_over = newImage("img/info_doprava_over.jpg");
		preloadFlag = true;
	}
}

function preloadImagesProg() {
	if (document.images) {
		program_home_over = newImage("img/program_home_over.jpg");
		program_programPDF_over = newImage("img/program_programPDF_over.jpg");
		program_umelci_over = newImage("img/program_umelci_over.jpg");
		program_uvodni_text_over = newImage("img/program_uvodni_text_over.jpg");
		preloadFlag = true;
	}
}

function preloadImagesArchiv() {
	if (document.images) {
		archiv_icons_home_over = newImage("img/archiv_home_over.jpg");
		preloadFlag = true;
	}
}

function blank() {
	return true;
}

var ActOpacity = 0;
var ImgOpacity;

function NextOpacity(objImage)
{
  if (objImage.style.opacity != null)
    objImage.style.opacity = ActOpacity/100;
  else if (objImage.style.filter != null)
    objImage.style.filter = "alpha(opacity="+ActOpacity+")";
  ActOpacity = ActOpacity+2;

  if (ActOpacity <= 100)
  {
    ImgOpacity = objImage;
    setTimeout('NextOpacity(ImgOpacity)',5);
  }
}