function toggleMenu(id)
{
	// alle anderen menüs schliessen
	var a = document.getElementsByTagName("ul");
	for (var i=0; i < a.length; i++)
	{
		if (startsWith(a[i].id, "menu_") && (!endsWith(a[i].id, "_"+id)))
			a[i].style.display = 'none';
	}
		
	// das gewünschte menü togglen
	var menu = document.getElementById('menu_'+id);
	menu.style.display = (menu.style.display == 'none' ? 'block' : 'none');
}
function startsWith(string,prefix)
{
	return null != string.match(new RegExp("^"+prefix));
}
function endsWith(string,suffix)
{
	return null != string.match(new RegExp(suffix+"$"));
}

var slideshow_pics = new Array();
var slideshow_i = 0;
var slideshow_t = 5000;

function slideshow_next()
{
  slideshow_i++;
  if(slideshow_i >= slideshow_pics.length) {
  	slideshow_i = 0;
  }
  document.getElementById('slideshow').src = slideshow_pics[slideshow_i].src;
}
function slideshow_prev()
{
  slideshow_i--;
  if(slideshow_i <= -1) { 
  	slideshow_i = slideshow_pics.length-1; 
  }
  document.images["slideshow"].src = slideshow_pics[slideshow_i].src;
}
function slideshow_delay()
{
  slideshow_next();
  window.setTimeout("slideshow_delay()",slideshow_t);
}