I don't think partition magic will let you merge the partitions like that (I've used Partition Magic versions 3-5). It will only help you resize the partitions. I've never used or heard of the other one.
For your particular problem, depending how much data you have on the second partition, you have to manually move everything over as you resize (resize second part to minimum, move stuff to first part until first part full, repeat procedure until done). Or else, you could get a temporary hard drive or burn the data onto reliable CDRs, delete the secondary partition, resize the first one, and restore the data.
Best of luck to ya.