$(document).ready(function()
{
	//scroll the message box to the top offset of browser's scrollbar
	$(window).scroll(function()
	{
  		$('#message_box').animate({top:$(window).scrollTop()+"px" },{queue: false, duration: 250});
	});
  
  //when the close button at right corner of the message box is clicked 
	$('#close_message').click(function()
	{
  	//the messagebox gets scrool down with top property and gets hidden with zero opacity 
		$('#message_box').animate({ top:"+=15px",opacity:0 }, "slow");
	});
	
	setTimeout(function () { 
    $('#message_box').animate({ top:"+=15px",opacity:0 }, "slow");
  }, 5000);
	
});