Saira,
Followling link describes details of extending your stay while being in Canada. Appearently you can apply there 30 days before expiry of your visa.
cic.gc.ca/english/visit/extend-stay.asp
I am slightly surprised by the immediate changes in detail of yours i.e. your husband's job no longer remains and he is looking for another. From what i know, if he was on a temp work permit, he cannot switch employer and if he does so, he will have to get work visa again (possibly getting LMO again if his profession was not on the list, which does not require LMO). This would take some time at least. Also what i described earlier i.e. spouse being eligible for open work permit holds only for skill classes 0,A or B (there are specific NOC codes for each profession and these include managers, engineers, IT professionals etc.).
But the bottom line is that there are ways to apply for extension while being in Canada so you should certainly try those out.
@Waqar,
Thank you very much. But it's not a big deal. When one himself goes through the frustration / delicacies of the process and realizes what a pain it is, then probably the best way to channel that is to try to help others avoid things you have faced and learned from.
Same goes to you being the primary initiator of the thread
Regards