How can I put a slash bevore a particular src-attribut

How can I put a slash bevore a particular src-attribut

Hi folks,

i have to work with absolute path (because of mod_rewrite) in my little CMS. But I cant't teach my editor (TinyMCE) to put a slash bevore the image-path.

Now I want to do it with jQuery but I dont know how! This is how my image-element looks like:
  1. <img src="useruploads/images/some_img.jpg">

and I want to change it to this:
  1. <img src="/useruploads/images/some_img.jpg">

there are a lot of images with differnt names on the site, so how can I match only these ones who has this specific src-attributs and put a slash bevore "useruploads" ?

Thanks a lot
Richard