go into includes/templates/YOUR_TEMPLATE/templates/tpl_contact_us_default.php, find the following line
HTML Code:
<div class="buttonRow forward"><?php echo zen_image_submit(BUTTON_IMAGE_SEND, BUTTON_SEND_ALT); ?></div>
change it to:
PHP Code:
<?php /*<div class="buttonRow forward"><?php echo zen_image_submit(BUTTON_IMAGE_SEND, BUTTON_SEND_ALT); ?></div>*/?>
but keep in mind, the way you have customers contacting you is through a direct "mailto:" link, which opens a new email window in their email client. any customer that doesn't have outlook or a mail client on their pc (eg: if they are using a web-based email like yahoo, gmail, etc) won't be able to easily email you. (just my 2 cents)