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;
}