var mandatories=["field_1"];
var emailfields=["field_1"];
var subscriberlists=[];
var optinsetups=[];
function checkForm()
{
  var msg = {
    "error_mandatory":"Füllen Sie alle mit einem * markierten Felder aus!",
    "error_email":"Bitte überprüfen Sie Ihre E-Mail-Adresse!",
    "error_list":"Bitte wählen Sie mindestens eine Liste!"
  };

  try
  {
    for (var i=0; i<mandatories.length; i++)
    {
      var cfObj=document.getElementById(mandatories[i]);
      if (cfObj!=null)
      {
        if (cfObj.type.toLowerCase()=="text")
        {
          if (cfObj.value.match(/^\s*$/)) throw msg.error_mandatory;
        }
        else if (cfObj.type.toLowerCase()=="radio" || cfObj.type.toLowerCase()=="checkbox")
        {
          var tmpObj=document.getElementsByName(cfObj.name);
          var tmpCheck=false;
          for (var j=0; j<tmpObj.length; j++)
          {
            if (tmpObj[j].checked==true)
            {
              tmpCheck=true;
              break;
            }
          }
          if(!tmpCheck) throw msg.error_mandatory;
        }
        else if (cfObj.type.toLowerCase().indexOf("select")>=0)
        {
          if (cfObj.selectedIndex<=0) throw msg.error_mandatory;
        }
      }
    }

    var regex = new RegExp(
      "^"+
      "[a-zA-Z0-9_\.\-]+"+
      "@"+
      "[a-zA-Z0-9_\.\-]+"+
      "\\."+
      "[a-zA-Z0-9]{2,4}"+
      "$"
    );
    for (var i=0; i<emailfields.length; i++){
      if(!regex.test(document.getElementById(emailfields[i]).value)) throw msg.error_email;
    }

    document.getElementById("subscribe").submit();
  }
  catch(e)
  {
    window.alert(e);
  }
}