function browser() {
 try{
	//Opera 8.0+, Firefox, Safari
	return new XMLHttpRequest();
   } catch(e) {
	try{
	   //Internet Explorer
	   return new ActiveXObject("Msxml2.XMLHTTP");
	} catch(e) {
	   try{
		return new ActiveXObject("Microsoft.XMLHTTP");
	   } catch(e){
		alert("Browser not supported!");
		return false;
	   }
	}
   }
}