Replace text occurrence with AS

Hi,

I am looking for a script in which I can set a search string and a replace string and it will simply go through the front most document, replace all search string with replace string.

So basically it will interate through all the textboxes, search the string and replace it.

If someone has written that script or know of it (it probably will be less than 30-40 lines), please share it.

Thanks...