Caustion Noob question: If and If statements?

I am trying to write an If and If statement with PHP

Heres what I got so far:
<?php if(function_exists('ns_show_top_commentators') ) and (is_home()) { ?>

I keep getting errors, so can you do if and statements with php and if so where am I fudging it?

 

<?php

if (function_exists('ns_show_top_commentators') and is_home())
{

?>

Content here

<?php
}
?>

PHP:

 

yes you opened your if statement, and then closed it before getting to the and

 

Thanks yall.