in the end i did decided to hold it, until friday. Friday I went to the bank the check was issued from and was able to cash it (though i know there wasn't enough left for my coworker to cash her check). I called and left my boss a message on the business line telling her i was unable to hold the check any longer, not her cell phone (which i did have) and haven't heard from her yet. I don't know if she expects me to come in tuesday or not.
She still owes me a check, well actually 2 checks, one on March 1st and one on March 16th for the time i've worked. I hope my cashing the check doesn't cause problems getting those two checks, but i just don't see where she is going to get the money to cover them.
Thanks though for all the advice, I don't think i would have thought to go to the bank that issued the check unless you suggested it.
She still owes me a check, well actually 2 checks, one on March 1st and one on March 16th for the time i've worked. I hope my cashing the check doesn't cause problems getting those two checks, but i just don't see where she is going to get the money to cover them.

Thanks though for all the advice, I don't think i would have thought to go to the bank that issued the check unless you suggested it.