var deviceIphone = "iphone";
var deviceIpod = "ipod";
var deviceIpad = "ipad";
var deviceAndroid = "android";

//Initialize our user agent string to lower case.
var uagent = navigator.userAgent.toLowerCase();

function detectUserAgent(deviceName)
{
	return (uagent.search(deviceName) > -1)
}

function isMobileDevice()
{
	return (detectUserAgent(deviceIphone) || detectUserAgent(deviceIpod) || detectUserAgent(deviceIpad) || detectUserAgent(deviceAndroid));
}

function updateLightboxTop() { 
	var win_y = $(window).height(); 
	var scroll_y = $(window).scrollTop();

	if (isMobileDevice()) {
		$("#CB_Window").css({ top: (win_y * 0.5 + scroll_y) + "px" });
	}
}

var showTimer = false;
function updateLightboxTopWithTimer(evt) {
	if ( showTimer ) {
		clearTimeout( showTimer );
	}
	showTimer = setTimeout( updateLightboxTop, 100 );
}

$(window).bind( "scroll", updateLightboxTopWithTimer);