function switchlayer(Layer_Name)
	{
	var DINO = document.getElementById? 1:0 ;
	var NS = document.layers? 1:0 ;
	var IE = document.all? 1:0 ;
	
	if (DINO)
		{document.getElementById(Layer_Name).style.display = (document.getElementById(Layer_Name).style.display=='block') ? 'none' : 'block';}
	else if (NS)
		{document.layers[Layer_Name].display = (document.layers[Layer_Name].display == 'block') ? 'none' : 'block';}
	else if (IE)
		{document.all[Layer_Name].style.display = (document.all[Layer_Name].style.display == 'block') ? 'none' : 'block';}
	}

function closelayer(Layer_Name)
	{
	var DINO = document.getElementById? 1:0 ;
	var NS = document.layers? 1:0 ;
	var IE = document.all? 1:0 ;
	
	if (DINO)
		{document.getElementById(Layer_Name).style.display= 'none';}
	else if (NS)
		{document.layers[Layer_Name].display='none';}
	else if (IE)
		{document.all[Layer_Name].style.display= 'none';}
	return false;
	}

function oeffne_fenster(name,weite,hoehe)
	{
	var Fenstername = "";
	Fenstername = "Feldhaus"+weite+hoehe;
	var attribute = "";
	var t_width = screen.availWidth;
	t_width = t_width/2;
	var x_pos = t_width - (weite/2);
	if (x_pos < 0 || screen.availWidth < weite) x_pos = 0;
 	attribute = "width="+weite+",height="+hoehe+",scrollbars=yes,resizable=yes,left="+x_pos+",top=94";
	Fenster = window.open(name, Fenstername, attribute);
	Fenster.focus();
	}

function oeffne_bild(name,weite,hoehe)
	{
	var Fenstername = "";
	Fenstername = "Feldhaus_Projekt"+weite+hoehe;
	var attribute = "";
	var t_width = screen.availWidth;
	t_width = t_width/2;
	var x_pos = t_width - (weite/2);
	if (x_pos < 0 || screen.availWidth < weite) x_pos = 0;
 	attribute = "width="+weite+",height="+hoehe+",scrollbars=no,resizable=yes,left="+x_pos+",top=94";
	BildFenster = window.open(name, Fenstername, attribute);
	BildFenster.focus();
	}

function textfarbe()
	{
	var farbe1 = "#2a3e4e";
	var farbe2 = "white";

	var x,y;

	if (self.innerHeight) // all except Explorer
	{
		x = self.innerWidth;
		y = self.innerHeight;
	}
	else if (document.documentElement && document.documentElement.clientHeight)
		// Explorer 6 Strict Mode
	{
		x = document.documentElement.clientWidth;
		y = document.documentElement.clientHeight;
	}
	else if (document.body) // other Explorers
	{
		x = document.body.clientWidth;
		y = document.body.clientHeight;
	}

	if (y < 770)
		{
		document.getElementById("datumtext").style.color = farbe2;
		document.getElementById("adresstext").style.color = farbe2;
		}
	else
		{
		document.getElementById("datumtext").style.color = farbe1;
		document.getElementById("adresstext").style.color = farbe1;
		}
	}