function showAjaxLoader()
{
                obj=document.getElementById('ajaxloader');
		var t = (screen.availHeight/2)+getWindowScrollTop()-75;
		var l = (screen.availWidth/2);
                

		obj.style.left=Math.floor(l)+'px';
		obj.style.top=Math.floor(t)+'px';
		obj.style.visibility='visible';

}

function hideAjaxLoader()
{
	obj=document.getElementById('ajaxloader');
        obj.style.visibility='hidden';
}

// ---------------------------------------------------------

function getWindowScrollTop()
{
	if (document.documentElement && document.documentElement.scrollTop)
	{
		return document.documentElement.scrollTop;
	}
	else
	{
		return document.body.scrollTop;
	}
}

function getWindowHeight()
{
	if (document.documentElement && document.documentElement.offsetHeight)
	{
		return document.documentElement.offsetHeight;
	}
	else
	{
		return document.body.offsetHeight;
	}
}