function CheckValues(form)
{
var knachname = "" ;
var kvorname = "";
var kemail = "";
var message = "";
var isok = true;
reg = new RegExp("^([a-zA-Z0-9\\-\\.\\_]+)(\\@)([a-zA-Z0-9\\-\\.]+)(\\.)([a-zA-Z]{2,4})$");



knachname = form.nachname.value.toString();
        if ( knachname.value = "" || knachname.length == 0 ) {
                                message = message + "Sie müssen Ihren Nachnamen eingeben!\n";
                                isok = false ;
                                form.nachname.focus();
                                form.nachname.select();
                        }

kvorname = form.vorname.value.toString();
        if ( kvorname.value = "" || kvorname.length == 0 ) {
                                message = message + "Sie müssen Ihren Vornamen eingeben!\n";
                                isok = false ;
                                form.vorname.focus();
                                form.vorname.select();
                        }

kemail = form.absender.value.toString();
        if ( kemail.value = "" || kemail.length == 0 ) {
                                message = message + "Sie müssen Ihre Email-Adresse eingeben!\n";
                                isok = false ;
                                form.absender.focus();
                                form.absender.select();
                         } else if (!reg.test(kemail)){
                                message = message + "Bitte korrektes Email-Format verwenden!\n";
                                isok = false ;
                                form.absender.focus();
                                form.absender.select();
                         }


if (!isok) alert(message);

return isok;
}


function OpenWindow(address) {
  myWindow = window.open(address, "Kontaktformular", "width=390,height=664,left=100,top=200, toolbar=no");
  myWindow.focus();
}