function loadBrowserStyle(){
	var appStr = navigator.appName+"\n"+navigator.appVersion+"\n"+navigator.platform;
	appStr = appStr.toLowerCase();

	specialCSS = "css/special_default.css";
	if(appStr.indexOf("windows")>-1){
		//Windows
		if(appStr.indexOf("msie")>-1){
			//IE
			specialCSS = "css/special_ie.css";
			if(appStr.indexOf("msie 6")>-1){
				//IE 7.x
				specialCSS = "css/special_ie6.css";
			}
			
		}else if(appStr.indexOf("netscape")>-1){
		
		}
	}else if(appStr.indexOf("macintosh")>-1){
		//Mac OS
		
	}		
	document.open();
	document.write("<link rel=stylesheet type='text/css' href='"+specialCSS+"' title='externe Styles'>");
	document.close();
}
loadBrowserStyle();