How do I connect to Mysql?

<?php
// define vars
$sqlhost = "localhost";
$db_user = "sql_user_name";
$db_password = "sql_user_name_password";
<font color=green>
// now make the connection.
// note: $dbh is the database handle, you can make
// multiple connections if you want or give it
// a differenet name.[/tt]
$dbh = mysql_connect($sqlhost,$db_user,$db_password);
mysql_select_db($database_name,$dbh);
$err = mysql_error();
if ($err){
echo "Error in database : $err";
exit;
};
?>