User Accounts Question

My wife and I bought a new iMac and are sharing it as our home computer. I have set up two accounts, one for her and one for me, on the computer. I would like to see if there is a way to log in/out of each account or switch between them without having to enter a password each time. In other words, is there a way that I can just have it switch between the two without having to type a password each time? Running Mac OS 10.6.7

Thanks!

I'm afraid that the only way to do that would be to remove the password from both accounts, which would make the computer less secure.

Forget about ever planning a surprise birthday party for her again if you do that.