Well this all depends on wat browser you are usin, but first i would suggest you delete this message, if you don't want him to find out... lol.
If you are in Internet explorer (The new version) click Tools on the right hand side of the screen, somewhere near the top right, then select Delete Browsing History then click: DELETE TEMPOARY INTERNET FILES and DELETE HISTORY, and cookies and form data if you think your husband will really snoop around.
On the old version of explorer you have to click TOOLS at the top of the screen, then options and delete history i think, that was while ago.
In firefox and Netscape Navigator, I have only used the newest versions, but if you click Tools again and then Clear Private Data (Or just type Ctrl+Shft+Del) then tick all the boxes and press Clear Private Data Now, it should do it!
Hope it all works!
I have tried these all myself.