[quote name='JolietJake']I've been told before not to refuse a request from your boss. Saying "that isn't my job description" or " i don't get paid for that" is a good way to get canned. Of course, if you hate your job that may not matter. Job descriptions are basically non-existent today anyway.[/quote]
Well absolutely, if you get a better offer somewhere definitely use that to your advantage though things have changed now.
Back in the day it would be, you would get a better offer somewhere else, bring it up to your current boss before making any decisions, talk about what your current company can do for you to make you stay and if nothing can be worked out you end your tenure with the company mutually. This leaves the door open to possibly come back to that job if your new one fails in any way, shape, or form.
Now a days it's get offered new-job, immediately hand in re-signation papers, leave 2 days later.