Problem with forefox

hello friends i have a problem with firefox.
i am using AJAX and i want script to wait untill the we get the response from server, but it is not happning in firefox.
i am sending a script which i am using from last 6 minths in IE but it is not working in firefox




/*Javascript API for Server Call Back Using AJAX*/
var request001;
var local;
var return_data
function Init()
{
if(window.ActiveXObject)
{
//alert();
try
{
request001=new ActiveXObject("Msxml2.XMLHTTP"); // CREATE OBJECT

}
catch(e) //IF FAILED
{
try
{
request001=new ActiveXObject("Microsoft.XMLHTTP");// THEN TRY ANOTHER

}
catch(oc)// AGAIN FAILED
{
request001=null;// RETURN NULL

}
}
}
else if(window.XMLHttpRequest)
{

//if(!request001&&typeof XMLHttpRequest!="undefined")// IF OBJECT CREATED
//{
request001= new XMLHttpRequest(); //THEN GET THE FUNCTION
alert(request001)
//request001.overrideMimeType('text/xml');

//}
}

}
function SendRequest(URL)// GET THE REQUEST URL
{
return_data=null// SET OUTPUT TO BE NULL IN START

Init(); // INITIALIZED THE COMPONENT

if(request001!=null)
{


request001.onreadystatechange = Process; // PROCESS THE onreadystatechange
request001.open("GET",url+"/" +URL ,false);// SET THE METHOD [GET/POST] AND THE MODE
request001.send("");

}
return return_data
//return return_data+"---wer --";
}

function Process()
{
//onreadystatechange IS A EVENT WHICH ITERATES ITSELF TILL IT NOT GETS THE PERFECT CONDITION. I.E. THE FULL REENDER OF THE PAGE


if (request001.readyState == 4)// CHECK FOR THE STAT 4
{
alert("-");

if (request001.status == 200)// CHECK FOR THE STATUS 200
{

alert(request001.responseText);
if(request001.responseText=="")
{


}
else
{

var result=request001.responseText;
alert(result+"---")
result=result.substring(0,result.indexOf("@"));// EXTRACT DATA BEFORE @ TO AVOIDE GARBAGE

return_data=result; //SET THE OUTPUT TO THE RESULT

}
}
else
{


}

}
}

please put your code surronded by [ CODE ] tags, otherwise you lost me from the word go...

colton22