function createXMLHttpRequest() { 
  
	var ua; 
  
	if(window.XMLHttpRequest) { 
		try { 
			ua = new XMLHttpRequest(); 
		} catch(e) { 
			ua = false; 
		} 
	} else if(window.ActiveXObject) { 
		try { 
			ua = new ActiveXObject("Microsoft.XMLHTTP"); 
		} catch(e) { 
			ua = false; 
		} 
	} 
	return ua; 
}