How do i make yahoo or gmail my default mail client instead of outlook?

I hate outlook! i want it to be gmail. Like when I respond to CL job posintgs Outlook pops up, I would like gmail to instead. I have vista if that makes a difference and use firefox...How do i make yahoo or gmail my default mail client instead of outlook?
I've only been able to set that up by installing one of these programs... Either one will set gmail as the default program rather than outlook.



If you use google chrome: https://chrome.google.com/extensions/det鈥?/a>



Gmail notifier will also do that: http://toolbar.google.com/gmail-helper/n鈥?/a>



Worst case, you can always right click --%26gt; ';copy link address'; then paste that into gmail, remove the ';mailto:'; bit before sending if it is there.