Turn text link into button

[vatel]

Hello,

I am not exactly a php guru, so something banal in HTML becomes a complicated matter for me when php is involved

I am trying to change this:

<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>

into a form button that says "Checkout"

and this:

<div class="buttonRow center"><?php echo '<a href="javascriptopupWindow(\'' . zen_href_link(FILENAME_POPUP_SHIPPING_ESTIMATOR) . '\')">' .
zen_image_button(BUTTON_IMAGE_SHIPPING_ESTIMATOR, BUTTON_SHIPPING_ESTIMATOR_ALT) . '</a>'; ?></div>


into a form button that says "Shipping Estimator".

Any suggestion?
Thanks in advance