Possible Duplicate:
What is the best way to prevent highlighting of text when clicking on its containing div in javascript?
When a user clicks and drags how do you stop firefox from highlighting your content?
This has already been answered here: What is the best way to prevent highlighting of text when clicking on its containing div in javascript?
Basically, for firefox, you should be able to do this in CSS:
div.noSelect {
-moz-user-select: none;//mozilla browsers
-khtml-user-select: none;//webkit browsers
}
For IE you can apparently "add a handler to the ondragstart event, and return false;"