visible anchor tag only in main page

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Joomla

i am having anchor tag which contains image i put it inside the body tag in my joomla index.php page. i want to make is visible only for my main page. not for all pages. i have tried this code but useless.

<?php
if ($option == 'com_frontpage' || $option == '') {
      <a href="" style="visiblity: visible;"><img src=""></a>
}
?>

kindly help me out.

thanks in advance