Show only first attached image from post

Hey,

I’m trying to get posts in my blog to show only the first image attached when on the index page. Then when you click through, all the images attached to a post show up [as usual].

I’ve tried szub_post_image(); and post_image(); [via here: http://guff.szub.net/2006/02/09/post-image/%5D but due to the default name extension change in 2.5 it no longer works.

Anyone got any ideas on how i might go about doing this?