var backlink = "navback";
var kwshow = "kwnav";
var gallery = "galleryPopup";
var objOverlay = "overlay";
var pobj = "box";
var nevent = "next_event";
var pevent = "prev_event";
var events = "event_";
var footer = "footer"
var aevent = 1;

if (document.getElementById) {
	doc = "document.getElementById('";
	style = "').style.";
	visible = "block";
	visible2 = "inline";
	hidden = "none";
	inner = "').innerHTML";
} else if (document.layers) {
	doc = "document.";
	style = ".";
	visible = "block";
	visible2 = "inline";
	hidden = "none";
	inner = ".innerHTML";
} else if (document.all) {
	doc = "document.all.";
	style = ".style.";
	visible = "block";
	visible2 = "inline";
	hidden = "none";
	inner = ".innerHTML";
}

function show_gallery() {
  eval(doc+gallery+style+"display='"+visible+"';");
  //eval(doc+objOverlay+style+"display='"+visible+"';");
  eval(doc+pobj+style+"display='"+hidden+"';");
  eval(doc+footer+style+"display='"+hidden+"';")
}

function hide_gallery() {
  eval(doc+gallery+style+"display='"+hidden+"';");
  //eval(doc+objOverlay+style+"display='"+hidden+"';");
  eval(doc+pobj+style+"display='"+visible+"';");
  eval(doc+footer+style+"display='"+visible+"';")
}

function show_back() {
  eval(doc+backlink+style+"display='"+visible+"';");
  eval(doc+kwshow+style+"display='"+hidden+"';");
}

function hide_back() {
  eval(doc+backlink+style+"display='"+hidden+"';");
  eval(doc+kwshow+style+"display='"+visible+"';");
  reset_event()
}

function reset_event() {
	aevent = 1;
}

function next_event(max) {
  var l = aevent+2;
  if (l >= max)
  {
    eval(doc+nevent+style+"display='"+hidden+"';")
  }
  eval(doc+pevent+style+"display='"+visible2+"';");
  eval(doc+events+aevent+style+"display='"+hidden+"';")
  eval(doc+events+l+style+"display='"+visible+"';");
  aevent += 1;
}

function prev_event(max) {
  var f = aevent-1;
  var l = aevent+1;
  if (f <= 1)
  {
    eval(doc+pevent+style+"display='"+hidden+"';")
  }
  eval(doc+nevent+style+"display='"+visible2+"';");
  eval(doc+events+l+style+"display='"+hidden+"';")
  eval(doc+events+f+style+"display='"+visible+"';");
  aevent -= 1;
}