changing css in categorys(again)

Hi everyone
I know this has been a topic for a while but it´s driving me mad and I just can´t figure what I´m doing wrong..
All I want to do is to change the css if the category changes. I´m using Mapleleaf theme and after reserarch i´ve come to the conclussion that the best way to do this is with a conditional tag on header.php.
This is the code:

<style type=”text/css” media=”screen”>
@import url(<?php bloginfo(‘stylesheet_url’);?>);
@import url(‘category-8.css’);
</style>

<link rel=”alternate” type=”application/rss+xml” title=”RSS 2.0″

href=”<?php bloginfo(‘rss2_url’); ?>” />

<?php if(is_category(‘8’)){ ?>
<link href=”http://myblog.com/category-8.css&#8221; type=text/css rel=stylesheet>
<?php } else { ?>
<link href=”http://myblog.com/style.css&#8221; type=text/css rel=stylesheet>
<?php } ?>

(it goes on but this is the bit we need)
I´m just trying with one category at the moment. Of course I´ve uploaded category-8.css in the mapleleaf theme folder. The result is none: it displays the default style.css even if we click on category-8.
Can someone figure out what´s happenning? Am I missing something?

Thanks a lot.