Switching to disc 2

I am using Epsxe 1.70 and I am confused on how to switch discs for a multi-disk games I tried opening the menu and clicking file, change disc, ISO. and I selected the ISO for disc 2 but there was no change the game stayed at the Please insert disc 2 screen. Can someone help with this? Thanks.

well its easier for me to mount the image with daemon tools
and run cdrom...then
1.change disc->cdrom (dont press the ok command yet!)
2.change the image mounted in daemon tools with disc2..
3.click the ok command!the game will continue that way!try it ;D