kabust

Hi, I was wondering if someone can help me with this situation. I have four shops and i have already installed security cameras in each shop, i was wondering what's the best way to connect all four shops using the internet in order to access the DVR's located in each site in order to watch, playback from anywhere i am using the internet. Please note that i'm using a web bassed DVR therefore i do not need a special software to access them using the internet. Thank you in advance