You can "suspend" the appearance of the checkout button on the main page shopping cart by editing:
includes/templates/template_default/templates/tpl_shopping_cart.php
(Ftp a COPY to your hard drive, as you must also create an OVER-RIDE file in your own template later)
Find this line:
HTML Code:
<div class="buttonRow forward"><?php echo '<a href="' . zen_href_link(FILENAME_CHECKOUT_SHIPPING, '', 'SSL') . '">' . zen_image_button(BUTTON_IMAGE_CHECKOUT, BUTTON_CHECKOUT_ALT) . '</a>'; ?></div>
Using HTML COMMENT TAGS, disable the line as follows:
HTML Code:
<!-- <div class="buttonRow forward"><?php echo '<a href="' . zen_href_link(FILENAME_CHECKOUT_SHIPPING, '', 'SSL') . '">' . zen_image_button(BUTTON_IMAGE_CHECKOUT, BUTTON_CHECKOUT_ALT) . '</a>'; ?></div>-->
DO NOT delete the line... comment it out as I have shown.
SAVE the file on your hard drive.
FTP it to:
includes/templates/YOUR_CUSTOM_TEMLATE/templates/
NOTE: This file - like the one in the sidebox - has the same name... tpl_shopping_cart.php
They are NOT THE SAME FILE (content wise) and must not be confused with each other...