function show_loading(container, loading_overlay)
{
  var loading_container = "<div class=\"jquery_overlay_loading\" id=\"" + loading_overlay + "\"><table cellpadding=0 cellspacing=0 width=100% height=100% border=0><tr><td align=center valign=middle><img src=\"images/ajax-loader.gif\" width=25 /></td></tr></table></div>";
  
  $(container).css('position','relative');
  $(container).css('min-height','43px');
  $(container).css('width','100%');
  //$(container).html($(container).html()+ loading_container);
  $(container).html(loading_container);
  $("#" + loading_overlay).height($(container).height()+15);
  $("#" + loading_overlay).width($(container).width());
  $("#" + loading_overlay).show();

}
function hide_loading(loading_overlay)
{
  $("#" + loading_overlay).remove();
  
}

function load_newsletter()
{
	if ( !isEmail($('#txtEmailRequire').val()) )
	{
		alert("Vui lòng nhập Email hợp lệ");
		document.frm.txtEmailRequire.focus();
		return false;
	}	
	
	 $.ajax({ 
			   type: "POST", 
			   url: "index.php?open=newsletter", 
			   data: "email="+encodeURI($('#txtEmailRequire').val()), 
			   success: function(msg){ 
				 $("#div_result_search").html(msg); 
	   } ,
			   beforeSend: function(msg){ 
				show_loading("#div_result_search", 'loading_overlay_1');
			   } ,
			   complete: function(msg){ 
				hide_loading();   
			   }
			 });
	 
}