OIC. The only way I can think of is to turn your office computer into a wifi hotspot, then use your phone wifi to connect to it.
If your office computer does not have wifi built-in, you can use a USB dongle too.
As for the detail instruction, try google, I guess. For example, using the keywords "windows become wifi hotspot" it shows method for Win7 in the first result:
http://www.google.com/search?hl=en&...me+wifi+hotspot&aq=f&aqi=m1&aql=&oq=&gs_rfai=
Hope it helps.
Appreciate this. Thanks a lot! Will try it out. I found a solution but it requires using the Terminal to code a bit.