function browser()

 {
   
    var name_des_browsers;
    var browser_userAgent;

    name_des_browsers=navigator.appName;
    browser_userAgent=navigator.userAgent;

    if (name_des_browsers=="Netscape")

      {

        if (browser_userAgent.indexOf("compatible")>-1)
         {

	   if (browser_userAgent.indexOf("Opera")>-1)
             {
               // Der Opera-Browser wird verwendet
               window.open ("indexop.html");
             }

           if (browser_userAgent.indexOf("StarOffice")>-1)
             {
              // Der StarOffice-Browser wird verwendet
              window.open ("indexso.html");
              }
         }
       else
         {
             // Der Netscape-Browser wird verwendet
             window.open ("indexnc.html");
         }

    }      
    
   if (name_des_browsers=="Microsoft Internet Explorer")

      {

        // Der Microsoft-Browser wird verwendet

        document.open ("indexmi.html");

      }
   
 
 }


// anzeigen und ausblenden von layern

var old;
var memold;


if(document.layers)
{
	window.captureEvents(Event.MOUSEDOWN);
	window.onmousedown=do_out;
} else
{
	document.onmousedown=do_out;
}



function show_layer(x)
{
	document.layers[x].visibility="show";
}

function hide_layer(x)
{
	document.layers[x].visibility="hide";
}

function do_menu(x)
{
	if(!old)
		old=memold;

	if(old!=x)
	{
		show_layer(x);
		old=x;
	} else
		old="";
}

function do_check(x)
{
	if(old && old!=x)
	{
		hide_layer(old);
		show_layer(x);
		old=x;
	}
}

function do_out()
{
	if(old)
		hide_layer(old);

	memold=old;
	old="";
}