I need some help please?

I am working as a Christmas Temp at ARGOS AND i HAVE �260 TO PAY FOR MY RENT MONEY IN FEBRUARY AND REALLY I NEED A FULL TIME JOB, HOW DO I LOOK FOR A FULL TIME JOB WHILE WORKING THERE?I MEAN HOW DO I ARRANGE FOR AN INTERVIEW ON A DAY WHEN I AM NOT WORKING THERE AS I WORK IN THE WEEK?WHAT DO I TELL COMPANIES WHEN THEY PHONE ME UP AND THEY ASK WHY I CANT COME TO THE INTERVIEW ON A CERTAIN DAY?THE REASON WHY I AM LOOKING IS THAT I CANT SEE THEM KEEPING ME ON AFTER CHRISTMAS EVE AS THAT'S WHEN MY CONTRACT ENDS!!!THIS CREDIT CRUNCH PROBLEM IS EFFECTING "EVERYTHING"!