function getURLParam(URL) {   
            var strReturn = "";
            var strHref = window.location.href;
            
            if ( strHref.indexOf("?") > -1 )
            {
                        var strQueryString = strHref.substr(strHref.indexOf("?"));
                        var aQueryString = strQueryString.split("&");
                        
                        for ( var iParam = 0; iParam < aQueryString.length; iParam++ )
                        {
                                   if (aQueryString[iParam].indexOf("mid=") > -1 )
                                   {
                                               var aParam = aQueryString[iParam].split("=");
                                               strReturn = aParam[1];
                                               break;
                                   }
                        }           
            }
            document.getElementById('myFrame').src = URL+strReturn;
}
getURLParam('https://news.vertbaudet.de/frm/anmelden.aspx?mid=');