function getHTTPObject(){
	var xmlHttp=null;
	try
	 {
		 // Internet Explorer 6 or up
		 xmlHttp=new ActiveXObject("Msxml2.XMLHTTP"); 
	 }
	catch (e)
	 {
		 // Internet Explorer 5.5
		 try
		  {
			  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		  }
		 catch (e)
		  {
			  try
			  {
			  	// Firefox, Opera 8.0+, Safari
				  xmlHttp=new XMLHttpRequest();
			  }
			  catch(e)
			  {	// lynx...
				  alert('Your browser doesn not support ajax. Please upgrade to your browser to a recent one, e.g. Mozilla FireFox 3.5');
			  }
		  }
	 }
	return xmlHttp;
}