Does anybody know how to do this

[thorthedestroyer]

Does anybody know how to create an image that blinks like this one ... do I need to use javascript or what?

[yourlawyer.com...]

Thanks so much in advance :-)

[Dijkgraaf]

It is called an animated gif.
No, no JavaScript or any other script is required.

You will either need a graphics program capable of creating an animated gif though, or aquire the rights to use an existing image.
Do a search for gif animator or animated gif respectively.