AlegroCart

same as title..
hw can i create it, i want use my own widget in bloger & use it to my shop

* sory for my bad english

Yes.
You would be best to look at another module to copy format.
Something like module currency or module cart.
In admin, you need controller, language, template and model to create the basic enable of disable the module.

In catalog, your need the extension/module/ your controller file, language/extension/module/ your language file, template/default/module/ your template file. You will also need the model file if this module is using database.

To set where it displays and which pages it is available on, your do all that in the template manager.

I already have the images, the code to make them rotate just don't know where or which file to insert the code in.

I want to do it kinda like a banner, but have the images show up where the homepage image normally would be

You can do it in the home page module or the subheader module.