Conditional tags for posts

Hi guys

I’m trying to change the H1 tag in my header and the header image as well. I write a php condition tag and it doesn’t work for my posts, for pages works nicely.

<?php if ( is_page('25')) : ?>
page 25
<?php elseif ( is_page('7')) : ?>
page 7

<?php elseif ( is_page('66')) : ?>
Page 66

<?php elseif ( is_page('22')) : ?>
Page 22

<?php elseif ( is_page('76')) : ?>
Page 76

<?php else : ?>Page
<?php endif; ?>

Page 66 is the post, i’ve tried with is_single and put the title and the slug in the () and it still doesn’t work. This is the first problem.

I wanted to change the image header for each page but i don’t know how to make it work, i’m not a very advanced php user so its hard make it work.

Thanks for the help guys