temporarily replace an image hosting url

Hello.

On all of my wordpress pages im using dropbox to host the images.

so my image links are all http://dl.dropboxusercontent.com/etc/etc.jpg

Is there a plugin I can use to temporarily change the “dl.dropboxusercontent.com” url so I can root it to my webserver image with the exact same directory such as “http://mysite.com/etc/etc.jpg”

So I want to temporarily replace dl.dropboxusercontent.com with mysite.com