function changeImages() 
{
	for (var i=0; i<changeImages.arguments.length; i+=2) 
	{ 
		document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
	}
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////		
var akt_layer = -1;

function openSubMenue(nr)
{
	if (document.getElementById)
	{
		if( akt_layer != -1 )
		{
			document.getElementById( akt_layer ).style.visibility = "hidden";
		}
		document.getElementById( "offbutton" ).style.visibility = "visible";
		document.getElementById( nr ).style.visibility = "visible";
		akt_layer = nr;
	}
}

function closeSubMenue()
{
	if (document.getElementById && akt_layer != -1)
	{
		document.getElementById( "offbutton" ).style.visibility = "hidden";	
		document.getElementById( akt_layer ).style.visibility = "hidden";	
	}		
}
function nexttext(neu)
{
	if (document.getElementById)
	{
 		for(i = 1; i <= 3; i++)
	 	{
			id = 'text'+i; 
			document.getElementById(id).style.visibility = "hidden"; 
		} 
		document.getElementById(neu).style.visibility = "visible";	
	}
}

function backtext(neu)
{
	if (document.getElementById)
	{
		for(i = 1; i <= 3; i++)
	 	{
			id = 'text'-i; 
			document.getElementById(id).style.visibility = "hidden"; 
		} 
		document.getElementById(neu).style.visibility = "visible";	
	}
}

//mailformular
	function check()
	{
		
	if(	window.document.forms[ "mail" ].vorname.value == "")
	{
	alert( "Bitte tragen Sie Ihren Vornamen ein!");
	document.mail.vorname.focus();
	return false;
	}
	
	else
	if(	window.document.forms[ "mail" ].nachname.value == "")
	{
	alert( "Bitte tragen Sie Ihren Nachnamen ein!");
	document.mail.nachname.focus();
	return false;
	}
	
	else
	if(	window.document.forms[ "mail" ].email.value == "")
	{
	alert( "Bitte die E-Mail Adresse angeben!!!");
	document.mail.email.focus();
	return false;
	}
	
	else 
	if(
	window.document.forms[ "mail" ].email.value.indexOf( "@" )<= 2 ||
	window.document.forms[ "mail" ].email.value.indexOf( "." )<1
	)
	{
	alert( "Bitte eine gueltige E-Mail Adresse angeben!!!");
	document.mail.email.focus();
	return false;
	}
	
	}
	
	function notermin()
{	
	if(document.mail.termin.checked == true)
	{
	document.getElementById('terminfeld').style.display = 'block';
	document.getElementById('terminfeldno').style.display = 'none';	
	}else
	document.getElementById('terminfeld').style.display = 'none';
	document.getElementById('terminfeldno').style.display = 'block';
}

/////////////////////////////////////////////////////////////////////////////

function OpenNewWindow(url,name,xsize,ysize)
	{
		
 		ScreenWidth = screen.width;
		ScreenHeight = screen.height;

		xpos = (ScreenWidth/2)-(xsize/3);
		ypos = (ScreenHeight/2)-(ysize/2);
		NewWindow=window.open(url,"name","height="+ysize+",width="+xsize+",scrollbars=yes,resizable=yes,top="+ypos+",left="+xpos+"");

		NewWindow.document.close();
		NewWindow.resizeTo(xsize,ysize); 
	}