Question : Mysql conncetion problem

I try to connect with below code to Mysql database,
but it says
Warning: mysql_connect() [function.mysql-connect]: Can't connect to local MySQL server through socket ....
Database is not available. Try again later.
but the code must be correct..
what seems to be the problem

<?php
$con = mysql_connect("localhost","xxxxxx","xxxxxxxxxx");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

// some code
?>

Answer : Mysql conncetion problem

yes syntax is correct:
<?php
$dbhost = 'localhost';
$dbuser = 'root';
$dbpass = 'password';
$conn = mysql_connect($dbhost, $dbuser, $dbpass) or die ('Error connecting to mysql');
$dbname = 'db_name';
mysql_select_db($dbname);
?>