Check out my button! (on the sidebar)
If you want to add it to your blog, do the following:
Log in to your blog.
Click on layout.
Add a gadget.
Place it where you want it in your blog layout.
Copy the HTML code (that's underneath the button on my sidebar) into the "Content" box and leave the "Title" box blank.
Click Save to take you back to the blog layout.
Click Save changes, and voila!