XML and Ampersand

I'm writing a piece of code that is parsing a file and putting it
into a structured XML file. When i try to open up that xml file in IE
it will break at a line with an '&' symbol (ampersand) saying that
whitespace is not permitted here. I rewrote the piece of code
to avoid writing anything with an ampersand in it and it opens
fine in IE.

What do i have to do to fix this?

Thanks for any help....

If I understand you correctly when you need just an ampersand you use & rather than just plain &