Admin Form plugin not POSTing

Hi Guys

I am working on a form plugin for my admin section. I written a simple form but everytime I try submit it the input values are not POSTed. I don’t know if its my setup or something wrong with the code. I am using WAMPSERVER 2.0 – Below is my code:

<?php
/*
Plugin Name: My First plugin
Plugin URI: -
Description: -
Author: -
Author URI: -
*/

function printNewCoursePage() {
	if( isset($POST['stage']) && ('process' == $_POST['stage']) )
	{
		/*Course Title*/
		if($POST['course_title'] != "")
		{
			$course_title = filter_var($_POST['course_title'], FILTER_SANITIZE_STRING);
			if(trim($course_title) == "") {
				$errors['course_title'] = "Please enter a valid title" ;
			}
		}
	}
	else {
		echo "form not submitted";
	}
	?>
	<!-- HTML BEGIN -->
	<div class="wrap">
		<h2>Add New Course</h2>
		<form name="new_course_form" method="POST" action="<?php echo $_SERVER['REQUEST_URI']; ?>">
			<input type="hidden" name="course_form" id="course_form" />

			<!-- Course Details Start -->
			<div class="postbox">
				<h3 class="handletxt">Course Details</h3>

				<!-- Course Title -->
				<div class="insidebox">
					<div class="form_text">Course Title:</div>
					<input type="text" class="txtbox" name="course_title" value="<?php echo $course_title; ?>" id="course_title" />
				</div>
				<input type="hidden" name="stage" value="process" />
			<div class="postbox">
				<h3 class="handletxt">Publish</h3>
				<div id="major-publishing-actions">
					<input id="publish" class="button-primary" type="submit" value="Publish Course" name="submit"/>
				</div>
			</div>
		</form>
	</div>
	<!-- HTML END -->
	<?php	

}

function addNewCourse() {
	add_menu_page(
		'Courses',
		'Manage Courses',
		'administrator',
		'newcourse',
		'printNewCoursePage'
	);
}

add_action('admin_menu', 'addNewCourse');

?>