i have my database hosted in a server at the office, i can open the database in my browser when am at the office network by simply entering this address in my browser

http://192.168.1.11/fmi/webd#

I want to access the database from any browser, what could be a possible solution ?

There are several ways to achieve this.  You could setup a VPN from the remote location, you could Portmap a public IP number (ideally a static IP number) through your firewall to your 192.168 number, or you could go with a professional Filemaker Hosting company, like us, who would host your fmp12 file in a datacentre