function checkform ( form, lang )
{
  if (form.firmaname.value == "" || form.firmaname.value == "Firmenname" || form.firmaname.value == "Company name") {
  	if (lang == 0) {
		alert("Bitte ihre Firma angeben.");
	}
	else if (lang == 1) {
		alert("Please fill in your company name.");
	}
    form.firmaname.focus();
    return false ;
  }
  if (form.VorNachname.value == "" || form.VorNachname.value == "Vor- und Nachname" || form.VorNachname.value == "First name and Surname") {
  	if (lang == 0) {
		alert("Bitte ihren Namen angeben.");
	} else if (lang==1) {
		alert("Please fill in your name.");
	}
    form.VorNachname.focus();
    return false ;
  }
  if (echeck(form.email.value) == false) {
  	if (lang == 0) {
		alert("Bitte ihre E-Mail-Adresse angeben.");
	} else if (lang==1) {
		alert("Please fill in your E-Mail");
	}
    form.email.focus();
    return false ;
  }           
  if (form.code.value == "") {
    alert( "Bitte Sicherheitscode angeben." );
    form.code.focus();
    return false ;
  }
  
  return true ;
}

function echeck(str) {

        var at="@"
        var dot="."
        var lat=str.indexOf(at)
        var lstr=str.length
        var ldot=str.indexOf(dot)
        if (str.indexOf(at)==-1){
           return false
        }

        if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
           return false
        }

        if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
            return false
        }

         if (str.indexOf(at,(lat+1))!=-1){
            return false
         }

         if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
            return false
         }

         if (str.indexOf(dot,(lat+2))==-1){
            return false
         }
        
         if (str.indexOf(" ")!=-1){
            return false
         }

          return true                    
}