how to stop a sent after a give time

Dear Gurus,

I have and issue here where the "objXml.send(null);" is keep at sending page, how could I stop it after the "objXml.send(null);" line ?

Please advice. Thank you.

KY

objXml = new ActiveXObject("Microsoft.XMLHTTP");
objXml.open("GET", datafile, true);
objXml.onreadystatechange=function()
{
if (objXml.readyState==4&&objXml.status == 200)
{
..... // processing data
}
}
objXml.send(null);

objXml.abort();

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/xmlsdk/html/7b1cfc92-5078-404a-85a2-a907fe1184a2.asp