Mysql password security

[wxdqz]

Hello,

I am working on an application that will make me access a mysql database off my own server. the php app will be on a linux server and it will open a mysql database on the internet to retreive some data.
I was wondering, when I open a connection to mysql using:
mysql_connect("host","username",password");

how is the password is sent over, is it clear text or encrypted?
if it's clear text is there a way to encrypt it or make it more secure?

thanks

Ayman