Shouldn't be any problem - I've switched back and forth between 195/55R15 and 185/60R15 on my car. That's not to say there won't be any difference in handling and performance, though. But probably not a huge difference if the two tires are of similar construction.
As for load capacity, the two tires are probably the same, or at worst, very close. Compare the load index on the 185 tires with what it says on your car's tire placard (load index is the two-digit number after the tire size - probably 86, 87,or 88 in your case). If the 185's load index is the same or higher, you're good to go. If it's lower, then check out this thread for some more info:
http://www.canadiandriver.com/forum/index.php/topic,59465.0.html
