function onHomepageClick(sender, args) {
	var i = guide.Scene.getInstance();
	if (i.downloadInProgress == true || i.sceneRequested == true) return;
	
	var track = document.getElementById("track");
	track.src = "http://www.microsoft.cz/virtualnipruvodce/track/uvod.txt";

	i.sceneRequested = true;
	i.requestedScene = "main";
	clearMenuColors(sender);
	i.videoMarker = 0;
	cnvSubtitles = sender.findName("cnvSubtitles");
	cnvSubtitles.setValue("Visibility", "Collapsed");
	i.closeCurrentScene(sender);
}

function onLicenseClick(sender, args) {
	var i = guide.Scene.getInstance();
	if (i.downloadInProgress == true || i.sceneRequested == true) return;
	
	var track = document.getElementById("track");
	track.src = "http://www.microsoft.cz/virtualnipruvodce/track/licence.txt";

	i.sceneRequested = true;
	cnvSubtitles = sender.findName("cnvSubtitles");
	cnvSubtitles.setValue("Visibility", "Collapsed");
	i.requestedScene = "license";
	clearMenuColors(sender);
	i.root.findName("txtSubmenu1").foreground = "#FF000000";
	i.videoMarker = 0;
	i.licenseVideoFinished = false;
    i.closeCurrentScene(sender);
}


function onSupportClick(sender, args) {
	var i = guide.Scene.getInstance();
	if (i.downloadInProgress == true || i.sceneRequested == true) return;
	
	var track = document.getElementById("track");
	track.src = "http://www.microsoft.cz/virtualnipruvodce/track/support.txt";

	i.sceneRequested = true;
	cnvSubtitles = sender.findName("cnvSubtitles");
	cnvSubtitles.setValue("Visibility", "Collapsed");
	i.requestedScene = "support";
	clearMenuColors(sender);
	i.root.findName("txtSubmenu2").foreground = "#FF000000";
	i.videoMarker = 0;
	i.supportVideoFinished = false;
    i.closeCurrentScene(sender);
}

function onPartnersClick(sender, args) {
	var i = guide.Scene.getInstance();
	if (i.downloadInProgress == true || i.sceneRequested == true) return;
	
	var track = document.getElementById("track");
	track.src = "http://www.microsoft.cz/virtualnipruvodce/track/partneri.txt";

	i.sceneRequested = true;
	cnvSubtitles = sender.findName("cnvSubtitles");
	cnvSubtitles.setValue("Visibility", "Collapsed");
	i.requestedScene = "partners";
	clearMenuColors(sender);
	i.root.findName("txtSubmenu3").foreground = "#FF000000";
	i.videoMarker = 0;
	i.partnersVideoFinished = false;
    i.closeCurrentScene(sender);

}

function onCompaniesClick(sender, args) {
	var i = guide.Scene.getInstance();
	if (i.downloadInProgress == true || i.sceneRequested == true) return;
	
	var track = document.getElementById("track");
	track.src = "http://www.microsoft.cz/virtualnipruvodce/track/firmy.txt";

	i.sceneRequested = true;
	cnvSubtitles = sender.findName("cnvSubtitles");
	cnvSubtitles.setValue("Visibility", "Collapsed");
	i.requestedScene = "companies";
	clearMenuColors(sender);
	i.root.findName("txtSubmenu4").foreground = "#FF000000";
	i.videoMarker = 0;
	i.companiesVideoFinished = false;
    i.closeCurrentScene(sender);

}