function GetHttpRequest()
{
	// Gecko / IE7
	try { return new XMLHttpRequest(); }
	catch(e) {}

	// IE6
	try { return new ActiveXObject( 'Msxml2.XMLHTTP' ) ; }
	catch(e) {}

	// IE5
	try { return new ActiveXObject( 'Microsoft.XMLHTTP' ) ; }
	catch(e) {}

	return null ;
}