Resolved Aborting an AJAX request

[H3X]

Hey all, I am using this AJAX function to perform an action when it is called:

function xmlhttpPost(strURL, cword) {
	var xmlHttpReq = false;
	var self = this;
	if (window.XMLHttpRequest) {
		self.xmlHttpReq = new XMLHttpRequest();
	} else if (window.ActiveXObject) {
		self.xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
	}
	self.xmlHttpReq.open('POST', strURL, true);
	self.xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	self.xmlHttpReq.onreadystatechange = function() {
		if (self.xmlHttpReq.readyState == 4) {
			alert('hi');
		}
	}
	self.xmlHttpReq.send('q='+cword);
}

This is working fine, however, I want any previous AJAX requests to be aborted before beginning the new AJAX request. I have searched, and I can't find anything specific to the current structure of the AJAX function I am using to get the job done.

What changes must I make in order to do this?

Thanks!