Word docs breaking display of website

Hi

from last week i have been noticing that when somebody copy paste text from MS word docs in custom built discussion board it break the page display.
if i remove some of the lines at start of doc which are in html comment, page display is fine.

how i can make sure that when somebody copy paste from MS word doc it only copies the content and not all the styles associated with it?

it works fine with word 2003 but i think MS word 2010 is creating issue.
any idea what is happening here?

thanks

Word has its own proprietary HTML like format that gets used by copy/paste so that you can transfer formatting between different Microsoft programs. Some programs have a specific option for stripping out that formatting when you use that option to paste. The only other way I know of to get around it is to paste into notepad first and then copy again from there to the final destination.