Convert latin1 to utf8 problem

[nicholas pei]

Hi guys,

I have a trouble about the charset of mysql.

In my php page, I set charset is utf8 when the data is inserted to mysql database:
mysql_query("SET NAMES 'utf8'")

the database's charset is latin1. It's ok for english.But when I tried to insert chinese to the database, most of the chars is '??????'.
How could I convert the chars to a right format?

Some can help me ?
Thanks.