App that captures incoming html, etc. before it's rendered by browser, and replaces datastring with what I choose.

Whenever I visit a website, I want this app to automatically replace certain data strings with whatever strings I want *PRIOR* to being rendered in my browser. This replacement information will reside in a data file, the contents of which would look something like this: "foo" = "bar" "FOO" = "BAR" "whatever it says here" = "replace it with this" This app needs to replace data strings in scripts (javascript, vbscript, etc.) as well as plain old HTML, and also on scripts that are called using the [script src=""] tag. I need to be able to enter as many replacement instructions as I want, one per line. When user installs app, icon resides in Sys Tray, and a right-click produces three clickable options: a) Toggle on/off b) Remove icon from systray c) Update The first two are pretty self-explanatory. But if a user clicks Update, the application will retrieve the contents of a certain file online, let's call it... [login to view URL] ... and then populate the data file by overwriting it with the current contents of the [login to view URL] file. (Please give friendly error message if user isn't connected.) I know how to do this in PERL (by using a simple GET command and then use pattern matching and replacing), but now I need a desktop app, and I don't know enough VB or C to do this myself. Thanks for bidding, and let me know if you have any questions. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Complete ownership and distribution copyrights to all work purchased. ## Platform Windows 9x, 2K, XP IE 5 or better