function CreatePopup(url, height, duration, description, lifetime) {
    // Exit if the current browser has already received the popup, or 
    // the browser is not supported (IE6).
    if (HasAlreadyReceivedPopup(description) || IsUnsupportedUserAgent())
    	return;

 $.get(url, function (data) {
     var popup = $("<div>" + data + "</div>")
			.attr({ "id": "sliding_popup" })
			.css({ "top": -1 * height })
            .css({ "width": 742 })
            .css({ "align": "center" })
            .css({ "left": $(window).width() / 2-250 })
             .css({ "z-index": 1000})
            
	    	.height(height)
			.hide()
			.appendTo("body");

     ShowPopup(description, lifetime, popup, duration);
 });
}

function ShowPopup(description, lifetime, popup, duration) 
{ 
	popup.show().animate( { top: 0 }, duration);
	ReceivedPopup(description, lifetime);
}

function HasAlreadyReceivedPopup(description) { 
	return document.cookie.indexOf(description) > 0; 
}

function ReceivedPopup(description, lifetime) { 
	var date = new Date(); 
	date.setDate(date.getDate() + lifetime); 
	document.cookie = description + "=true;expires=" + date.toUTCString() + ";path=/"; 
}

function IsUnsupportedUserAgent() { 
	return (!window.XMLHttpRequest); 
}

function DestroyPopup(duration) {
	$("#sliding_popup").animate({ bottom: $("#sliding_popup").height() * -1 }, duration, function () { $("#sliding_popup").remove(); })
}