system= (navigator.platform.indexOf("Mac")==-1)?"PC":"MAC";
browser=(navigator.appName.indexOf("Microsoft")==-1)?"NS":"IE";
BrowserOnSystem=browser+"on"+system;

switch (BrowserOnSystem)
	{
	 case "IEonPC":
	 document.write("<link rel=stylesheet type='text/css' href='http://www.rheinmain-communication.net/css/ie_pc.css'>");
	 break;
	 case "NSonPC":
	 document.write("<link rel=stylesheet type='text/css' href='http://www.rheinmain-communication.net/css/ns_pc.css'>");
	 break;
	 case "IEonMAC":
	 document.write("<link rel=stylesheet type='text/css' href='http://www.rheinmain-communication.net/css/ie_mac.css'>");
	 break;
	 case "NSonMAC":
	 document.write("<link rel=stylesheet type='text/css' href='http://www.rheinmain-communication.net/css/ns_mac.css'>");
	 break;
	 default:
	 document.write("<link rel=stylesheet type='text/css' href='http://www.rheinmain-communication.net/css/ie_pc.css'>");
	 break;
	}
	
	
function jumpto(options, suchfeld){
var URL = 'bsuche.php?boption='+options[options.selectedIndex].value+'&suchfeld='+suchfeld;
document.location.href = URL;
}