Thimerosal in your vaccine?

An Immunisation Awareness Society website reader (call him “J”) comments:

Are you aware that on the Immunisation Advisory Centre website in New Zealand under Thimerosal safety they have said Ethyl Mercury is safe and does not cause mental retardation and other side affects. I then looked on the Eli Lilly safety data sheet [see link below] for Thimerosal and one of the side effects is mental retardation? Is this not misinformation to the public on a wide scale?

A good question, J.

Perhaps someone can answer this.