call function on specific page – how to

hello… pretty new to php. I am attempting to call a function on the home page only but i cant seem to understand the correct format. In example, here is what i am attempting to do:

<?php if ( is_home() ) { ?>
     <div style="width:715px; height:306px; margin:auto;">
		<?php if(function_exists('displayDDSlider')) { echo displayDDSlider(array(name=>"picture_page")); } ?>
     </div>
  <?php }

can ya help me out? thanks!
Paul