function bweiche()
{
	var bzusatz;
	var browser = navigator.userAgent;
	browser = browser.toLowerCase();
	var ganzzahl = parseInt(navigator.appVersion);
	var genauezahl = parseFloat(navigator.appVersion);

	//ist es netscape
	var netscap = ((browser.indexOf('mozilla')!=-1) && (browser.indexOf('spoofer')==-1) && (browser.indexOf('compatible') == -1) && (browser.indexOf('opera')==-1) && (browser.indexOf('firefox')==-1) && (browser.indexOf('webtv')==-1) && (browser.indexOf('hotjava')==-1));
	var netscap4 = (netscap && (ganzzahl == 4));
	var netscap4up = (netscap && (ganzzahl >= 4));
	var netscaponly = (netscap && ((browser.indexOf(";nav") != -1) || (browser.indexOf("; nav") != -1)));
	//ist es netscape 6
	var netscap6 = (netscap && (ganzzahl == 5));
	var netscape6up = (netscap && (ganzzahl >= 5));
	var is_gecko = (browser.indexOf('gecko') != -1);

	//ist es firefox
	var firefox = (browser.indexOf('firefox')>0);
	var firefox0 = (browser.indexOf('firefox/0.')>0);
	var firefox1 = (browser.indexOf('firefox/1.')>0);
	var firefox2 = (browser.indexOf('firefox/2.')>0);

	//ist es internet explorer 
	var explorer = ((browser.indexOf("msie") != -1) && (browser.indexOf("opera") == -1));
	var explorer3 = (explorer && (ganzzahl < 4));
	var explorer4 = (explorer && (ganzzahl == 4) && (browser.indexOf("msie 5")==-1));
	var explorer4up = (explorer && (ganzzahl >= 4));
	var explorer5 = (explorer && (ganzzahl == 4) && (browser.indexOf("msie 5.0")!=-1));
	var explorer5_5 = (explorer && (ganzzahl == 4) && (browser.indexOf("msie 5.5") !=-1));
	var explorer5up = (explorer && !explorer3 && !explorer4);
	var explorer5_5up =(explorer && !explorer3 && !explorer4 && !explorer5);
	var explorer6 = (explorer && (ganzzahl == 4) && (browser.indexOf("msie 6.0") !=-1));
	var explorer7 = (explorer && (ganzzahl == 4) && (browser.indexOf("msie 7.0") !=-1));
	//ist es opera
	var opera = (browser.indexOf("opera") != -1);
	var opera4 = (browser.indexOf("opera 4") != -1);
	var opera5 = (opera && (ganzzahl == 5));
	var opera5up = (opera && (ganzzahl >=5));
	//variablen sind 1, wenn bedingung zutrifft, sonnst 0
	if (netscap) {
	if (netscape6up) 
	bzusatz = "netscape6";
	else {
	if (netscape4up)
	bzusatz = "netscape4";
	else
	bzusatz = "netscape3";
	}
	}
	else {
	if (firefox) {
	if (firefox0) 
	bzusatz = "firefox0";
	else {
	if (firefox1)
	bzusatz = "firefox1";
	if (firefox2)
	bzusatz = "firefox2";
	}
	}
	else {
	if (explorer) {
	if (explorer7) 
	bzusatz = "ie7";
	else {
	if (explorer6) 
	bzusatz = "ie6";
	else {
	if (explorer5_5 || explorer5 || explorer5_5up)
	bzusatz = "ie5";
	else {
	if (explorer4up || explorer4)
	bzusatz = "explorer4";
	else
	bzusatz = "explorer3";
	}
	}
	}
	}
	else {
	if (opera) {
	if (opera5up) 
	bzusatz = "opera5";
	else {
	if (opera4)
	bzusatz = "opera4";
	else
	bzusatz = "opera";
	}
	}
	else
	bzusatz = "unbekannt";
	}
	}
	}
	if (bzusatz)
	{
		a=document.createElement('link');
		a.setAttribute('rel','stylesheet');
		a.setAttribute('href','/styles/ftc/styles_'+bzusatz+'.css');
		document.getElementsByTagName('head')[0].appendChild(a);
		//alert('/styles/ftc/styles_'+bzusatz+'.css');
	}
}
bweiche();