Ok, I have solved that error.
But Now I couldn't got any message unless "Start" for this code.
Code:
<?php
  echo ("Start");
$con = mysql_connect("localhost","home","iagree");
  echo ("Test2");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }
  echo ("End");

// some code

?>
What is problem now?