I'm really new to PHP, and I'm trying to set up an admin page for my friend's site. He and I are the only ones who will ever need admin access.

Is the following code secure?

Code:
<?php
	if (($_POST[username])=="myusername" AND $_POST[password]=="mypassword")
	{
		echo "you made it!";
	/* 	setcookie("admin", "true", time()+3600); */
	}
	else 
	{
		echo "Access restricted.";
	}
?>