var cajax;
  try {
  	cajax=new XMLHttpRequest(); // Firefox, Opera 8.0+, Safari
  }
  catch (e) {
  	// Internet Explorer
  	try {
  		cajax=new ActiveXObject("Msxml2.XMLHTTP");
  	}
  	catch (e) {
  		cajax=new ActiveXObject("Microsoft.XMLHTTP");
  	}
  }