This is a sharepoint 2007 custom type that enhances the functionality of the out of the box "Hyperlink or Picture" type. It basically allows, once added to a list, the ability to upload a picture from the custom list via open dialog box, avoiding the tedious task of uploading the picture to a picture library then copy the url and then paste the url into a "hyperlink or picture".
So instead of having a two step process you can upload a picture directly to a the custom list generate a thumbnail to show on the list view and if click on the thumbnail a popup with the real size picture will show.
This was my first attempt of creating a sharepoint custom type so once i publish the code here ill apreciate any comment in order to improve it.
I must tell that this is Kiril's Idea, great!!