Migrating to new host, need to reassign img links

I am in the process of moving a client between hosting providers. When they started using WordPress on their previous host, they imported posts from a previous blog that was run on godaddy’s blogcast platform, which stored the images all in one separate folder and referenced them from there. When the blogcast posts were imported, it just imported the referenced src location for each img, but did not add the actual image to the wordpress wp-content/uploads folder. So now when they leave godaddy (the old host) and migrate to the new one, those old images do not come along with the rest of the wordpress files.

What I need to know: is there is a way to bulk reassign the src tags to these posts? Anything short of re-inserting each image in over 230 posts would be a step in the right direction. Thanks!