dynamic page title not working on single posts

i have used the following code in my header.php

<title>
<?php
if (is_home()) {
	echo bloginfo('name');
} elseif (is_404()) {
	echo '404 Not Found';
} elseif (is_category()) {
	echo 'Category:'; wp_title('');
} elseif (is_search()) {
	echo 'Search Results';
} elseif ( is_day() || is_month() || is_year() ) {
	echo 'Archives:'; wp_title('');
} else {
	echo wp_title('');
}
?>
</title>

but for some reason when i click on the single post page the title dispalyed is my blog title.

i have tried using ALl in one SEO which works fine for what I am trying to achieve but for one reason or another messes up my JCarousel script.

A solution for either issue is appreciated!!!