var request = null;

function createRequest(){

try{
request = new XMLHttpRequest();
} catch (trymicrosoft){

try{
request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (othermicrosoft) {
try {
request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (failed) {

request = null;
}
}
}

if (request == null)
alert("Error creating request object!");
}


var requestB = null;

function createRequestB(){

try{
requestB = new XMLHttprequest2();
} catch (trymicrosoft){

try{
requestB = new ActiveXObject("Msxml2.XMLHTTP");
} catch (othermicrosoft) {
try {
requestB = new ActiveXObject("Microsoft.XMLHTTP");
} catch (failed) {

requestB = null;
}
}
}

if (requestB == null)
alert("Error creating requestB object!");
}