/**
 * Show the spinner
 * @return
 */
function ShowSpinner()
{
	var scrollX = 0;
	var scrollY = 0;

	if (window.innerHeight)
	{
		scrollX = window.pageXOffset;
		scrollY = window.pageYOffset;
	}
	else if (document.documentElement && document.documentElement.scrollTop)
	{
		scrollX = document.documentElement.scrollLeft;
		scrollY = document.documentElement.scrollTop;
	}
	else if (document.body)
	{
		scrollX = document.body.scrollLeft;
		scrollY = document.body.scrollTop;
	}

	var pageSize = getPageSize();
	var AjaxSpinner = document.getElementById('AjaxSpinner');

	AjaxSpinner.style.left = (scrollX + Math.round(pageSize[0] / 2) - 8) + "px";
	AjaxSpinner.style.top  = (scrollY + Math.round(pageSize[3] / 2) - 8) + "px";
	AjaxSpinner.style.display = "block";
}

/**
 * Hide the spinner
 * @return
 */
function HideSpinner()
{
	var AjaxSpinner = document.getElementById('AjaxSpinner');
	AjaxSpinner.style.display = "none";
}

/**
 * getPageSize() from lightbox.
 * Returns array with page width, height and window width, height
 * Core code from - quirksmode.org
 * Edit for Firefox by pHaez
 * @return array An array containing the page's width and height, the window's width and height
 */
function getPageSize()
{
	var xScroll, yScroll;

	if (window.innerHeight && window.scrollMaxY)
	{
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	}
	else if (document.body.scrollHeight > document.body.offsetHeight)
	{ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	}
	else
	{ // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}

	var windowWidth, windowHeight;
	if (self.innerHeight)
	{	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	}
	else if (document.documentElement && document.documentElement.clientHeight)
	{ // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	}
	else if (document.body)
	{ // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}

	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight)
		pageHeight = windowHeight;
	else
		pageHeight = yScroll;

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth)
		pageWidth = windowWidth;
	else
		pageWidth = xScroll;

	arrayPageSize = new Array(pageWidth, pageHeight, windowWidth, windowHeight);
	return arrayPageSize;
}