//centering popup  
function centerPopup_email_request(){  
//request data for centering  
var windowWidth_email_request = document.documentElement.clientWidth;  
var windowHeight_email_request = document.documentElement.clientHeight;  
var popupHeight_email_request = $("#popup_email_request").height();  
var popupWidth_email_request = $("#popup_email_request").width();  
//centering  
$("#popup_email_request").css({  
"position": "absolute",  
"top": windowHeight_email_request/2-popupHeight_email_request/2,  
"left": "508px"
});  
//only need force for IE6  
  
$("#popup_background").css({  
"height": windowHeight_email_request  
});  
  
}  
	$(document).ready(function() {
  		$('popup_email_request').hide();
		$('popup_background').hide();

		$('a#show_popup_email_request').click(function(){
		centerPopup_email_request();
		$('#popup_email_request').fadeIn('slow');
		$('#popup_background').fadeIn('slow');
		});
		
		$('a#close_popup_email_request').click(function(){
		centerPopup_email_request();
		$('#popup_email_request').fadeOut('slow');
		$('#popup_background').fadeOut('slow');
		});
		
		$("#popup_background").click(function(){  
		$('#popup_email_request').fadeOut('slow');
		$('#popup_background').fadeOut('slow');  
		});
		
		$(document).keypress(function(e){  
		if(e.keyCode==27){  
		$('#popup_email_request').fadeOut('slow');
		$('#popup_background').fadeOut('slow'); 
		}  
		});  
		
	});