// get the xmlHttp object
function getXmlHttpObject()
{
	var xmlHttp = null;
	
	try
	{
		// Firefox, Opera 8.0+, Safari
		xmlHttp = new XMLHttpRequest();
	}
	catch(e)
	{
		// Internet Explorer
		try
		{
			xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch(e)
		{
			xmlHttp= new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	
	return xmlHttp;
}