[jQuery] Find and replace image problem

[Chris K]

I have the image name in a variable and want to replace it but not
sure how to do this.

Currently I can replace the image src with:
var new_src = $(this).attr("src").replace(/ship.png$/i, fileObj.name);

I want to do something like this (which doesn't work):
var new_src = $(this).attr("src").replace(imagename, fileObj.name);

Any help is appreciated.

Chris