Help mounting issues


I have a HTC Hero and I cannot seem to mount it ...whatever that means. I am basically trying to upload my photos to my computer. Everything I have read says that I need to mount the sd card. The only options I have are 'charge only' 'htc sync' and 'internet sharing'. My computer is a mac if that matters. When I plug my phone in to the computer using the usb cord nothing shows up as plugged in (on my computer).