URL encoded data breaking

Howdy all,
I've got an MD5 hash that I URL encode and put in a querystring. When the + character is in the hash I escape it with %2B. This seems to work fine except sometimes the browser will change it back to a + character. Then, the URL decoding turns it into a space and things break. Other times the browser (IE and Mozilla) will leave it alone (as %2B). Anyone know a fix for this???
Thanks
Tripp

Not sure where your problem is happening with the encoding with your question
did you look into these: encodeURI, decodeURI, encodeURIComponent, and decodeURIComponent.

It's the browsers that are causing the problem. When the string is generated the format is correct. A lot of the time the links work. Other times I can see the data in the location bar change to the nonsafe format, then the operation fails. It's kinda odd. Not something that fails everytime.
-- T

Are we talking IE here??