// Layer ein und ausblenden
var displaying = false;
var layer = false;

function showhide(layer) {
	if(displaying != false && displaying != layer)
	{
		var hidenr = displaying;
		displaying = false;
		showhide(hidenr);
	}
	thisLayer = document.getElementById(layer).style;
	//thisExpander = document.getElementById("shimage"+layerNr);
	if (thisLayer.display == "block") {
		thisLayer.display = "none";
		//thisExpander.src = "images/layout/expand.gif";
		displaying = false;
	}
	else {
		thisLayer.display = "block";
		//thisExpander.src = "images/layout/collapse.gif";
		displaying = layer;
	}
}

var css = '<style type="text/css">'
			+'div.showhide,dd.showhide{display:none;}'
			+'</style>';
// write some css-values if javascript is enabled, for enhanced functionality provided with JS
document.write(css);