You could ask the listing agent to remove the photos but since you are the home owner the best way to have them removed is to contact Trulia directly.
You can call them at: 888-466-3501 from 7:00am-4:00pm M-F PST or send them an e-mail message requesting the photos removed at:
http://www.trulia.com/help/ask and be sure to include the entire address of your home.
The Trulia moderators should comply with your request and usually respond within 24-48 hours.
Prudential Connecticut Realty
Laura's answer below is correct. If your home is for sale you should ask you agent to remove any photos that you don't wish to be displayed online. If however your home is not currently for sale, then our Customer Service team can remove the photos from our site. Please give them a call at 888-466-3501 from 7:00am-4:00pm M-F PST or send them an e-mail message via the link below.