function _submit()
{
    var name = document.getElementById('first_name');
    var email = document.getElementById('email');
    var message = document.getElementById('message');
    var code = document.getElementById('code');
    var str='';
    
    if(name.value.search(/./i) == -1)
    {
        name.style.background = "#ff0000";
        str += 'Name';
    }else{
        name.style.background = "";
    }
    
    if(!(/^[a-z][.a-z0-9_-]+@[a-z][.a-z0-9_-]*\.[a-z]{2,4}$/i.test(email.value)))
    {
        email.style.background = "#ff0000";
        str += 'Mail';
    }else{
        email.style.background = "";
    }
    
    if(!(/^[0-9]{5}/i.test(code.value)))
    {
        code.style.background = "#ff0000";
        str += 'Mail';
    }else{
        code.style.background = "";
    }
    
    if(message.value.search(/./i) == -1)
    {
        message.style.background = "#ff0000";
        str += 'Message';
    }else{
        message.style.background = "";
    }
    
    if(str.length == 0)
    {
        document.getElementById('frm').submit();
    }else{
        return false;
    }
}