Oh, behave!

That's the advice of a new etiquette guide that says Americans should pipe down and brag less when they travel overseas.

The "World Citizen's Guide" - published by Business for Diplomatic Action, a nonprofit group dedicated to boosting our nation's reputation abroad - says the stereotype of the "Ugly American" is at an all-time high.

"Anti-Americanism is a growing trend that, unless checked, is certain to have wide-ranging and long-term negative effects," Keith Reinhard, president of BDA, said on the group's Web site.

"[There is] the perception that we are arrogant and insensitive as a people."

The group, funded by leading U.S. corporations, compiled a list of do's and don'ts with the help of the U.S. State Department. It recommends:

— Think as big as you like, but talk and act smaller. In many countries, any form of boasting is considered very rude.

— Listen at least as much as you talk. By all means, talk about America and your life here. But also ask people you're visiting about themselves and their way of life.

— Save the lectures for your kids. Whatever the subject, let it be a discussion not a lecture. Justified or not, the United States is seen as imposing its will on the world.

— Slow down.

— Speak lower and slower. A loud voice is often perceived as bragging.

— If you talk politics, talk - don't argue.

The guide also offers tips on how to keep from dressing too casually.