function validate_form(thisform) {

    var name = document.getElementById('txtName');
    var email = document.getElementById('txtEmail');
    var firm = document.getElementById('txtFirm');
    var comments = document.getElementById('txtComments');
    var captchacode = document.getElementById('captchacode');

    if (validate_required(name.value, "Name cannot be blank!") == false)
    { name.focus(); return false; }
    else if (validate_required(email.value, "Email cannot be blank!") == false)
    { email.focus(); return false; }
    else if (validate_email(email.value, "Please enter valid Email!") == false)
    { email.focus(); return false; }
    else if (validate_required(firm.value, "Firm cannot be blank!") == false)
    { firm.focus(); return false; }
    else if (validate_required(comments.value, "Please enter your comments!") == false)
    { comments.focus(); return false; }
    else if (validate_required(captchacode.value, "Please enter security image code!") == false)
    { captchacode.focus(); return false; }
    else return true;
}