using different images on post title
please see this http://decentsms.com
you can see there is an animated smiley on the title of every post.
i want to show different smileys for different categorie's post
i have uploaded three smilys : smiley1 , smiley2 and smiley3
and having three categories on my blog category1 , category2 and category.
when i post something in category1 i want smiley 1 to appear with the post title which are posted in category1 and when i posted something in category2 then it automatically shows smiley2 with post title posted in category2 .....
how can i do this????????