Some users who use Blogger's classic templates are seeing javascript inserted into the <title> elements of their pages. This results when users have modified the standard templates and have inserted the <blogger> and </blogger> tags into their <title> elements.
If your blog is affected, go to "Template", then click on "Edit HTML". Remove anything between <title> and </title> in your template, and replace it with this:
<$BlogPageTitle$>
We are looking at the feasability of adjusting our code to be sensitive to cases where the template has <blogger> tags inserted in the <title>, but for now please use the above work-around to eliminate the javascript code from your blog's page titles.