function checkMail() {

 res = true;
    
    if(document.contactMail.name.value == '')
    {
        res = false;
        Effect.BlindDown('errorName', { duration: 0.6 });
        window.setTimeout("Effect.BlindUp('errorName', { duration: 0.6 });", 3000);
    }
    else
    {
         reg = new RegExp('^([a-zA-Z0-9\\-\\.\\_]+)'+    //Name
                  '(\\@)'+                       //@-Zeichen
                  '([a-zA-Z0-9\\-\\.]+)'+        //Domain
                  '(\\.)'+                       //Punkt
                  '([a-zA-Z]{2,4})$');           //TLD
        if(reg.test(document.contactMail.email.value) == false)
        {
            res = false;
            Effect.BlindDown('errorEmail', { duration: 0.6 });
            window.setTimeout("Effect.BlindUp('errorEmail', { duration: 0.6 });", 3000);
        }
        else
        {
            if(document.contactMail.message.value == '')
            {
                res = false;
                Effect.BlindDown('errorMessage', { duration: 0.6 });
                window.setTimeout("Effect.BlindUp('errorMessage', { duration: 0.6 });", 3000);
            }
            else
            {
                if(res == true)
                {document.contactMail.submit();}    
            }
            
        }
        
    }

}