Minh,
Go to the home advisor website: http://homeadvisor.msn.com and scroll down near the middle of the page where it asks for a street address and zip code. enter an address and zip code( for example: 10646 KEMERTON RD 92126 ) and view the source on the resulting page.

instead of using html to say something like:

price of home = 200,000

it uses javascript and has:

var string = "price of home = " + priceVariable;
document.write(string);