Yes this can be done by making a new shortcut to launch couterstrike and then edit the properties of the shortcut with -connect and the ip and port and then just add a path to it in your popup.rc.
I would create a path in your evar.rc in your personal folder and just bang $cstrike$ from your popup.
It quite simple I use to do this with deathmatch on severians sons server...

Research google to find the properties tags