PowerPC :: Setting Up Webcam To Stream On IbookG4

I have an ibook G4 which connects wirelessly to a netopia router via airport card (under keypad on laptop) Recently came across Evocam and sounds like great software as just what i wanted to keep an eye on my dog whilst i am at work

but the problem i am having is that i can not view this webcam remotely (eg from work) I think i have tried every avenue but no direct help hence my query is being posted here! So what have i done so far:downloaded the 15 day free trial (not going to buy unless it works)got that going ok and interface showed IP and 8080 port clicked on view in browser and hey presto it work - but that is on local "internal" network and wont work over internet - so found out about port forwarding static IP etc so set a static IP which starts 192.168..... and got up router browser and opened/configured port to 8080. - still not working then was told i need my public IP when configuring the IP in the airport network page (sys pref - network - airport) so i did this and again came up fine on evocam interface but then realised I had no longer internet access so had to revert back to the original IP's, sub net mask DSN numbers so i could go online to see what i did wrong which is where i am now.

I understand from other forums and FAQ's that this is suppose to be pretty straight forward but i don't no where i am going wrong so this is my question need help to set up evocam on ibook through wireless and configure airport/ip/router CORRECTLY to make this work.
I have been in contact with evo support team over a number of emails but it all general info i am given and no step by step MAC process (for instance it says go into base station to port map view airport admin untility I go to this but no base station shows up for me to click on or re-configure is it because i just have apple airport card and not base station.I would appreciate it if anyone can help or know the steps i should follow to get this up and streaming my dog while at work