http_request failing between sites

im trying to call a page on "Server B" from "Server A" using http_request method. the problem is the request fails at http_request.open(). Below is the very basic code im using that can be found everywhere online.

Code Calling from a page on Server (site) A. Requesting URL is on Server (site) B

makeRequest('http://www.sitename.com/ajax_insert.php?field_name=test&field_value=',this.value);

Code (markup):

This is the code in the makeRequest() function which is on Server (site) A.

function makeRequest(url, parameters) {

	http_request = false;
	if (window.ActiveXObject) { // IE
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	} else if (window.XMLHttpRequest) {// Mozilla, Safari,...xmlHttpReq.overrideMimeType
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			// set type accordingly to anticipated content type
			http_request.overrideMimeType('text/xml');
		}else{ alert('Did not create *http_request.overrideMimeType*'); return false; }
	} 

	if (!http_request) {

		alert('Cannot create XMLHTTP instance');
		return false;

	}

	http_request.onreadystatechange = alertContents;

	// FOR GET VARS
	http_request.open('GET', url + parameters, true);
	http_request.send(null);
	
}

Code (markup):

So what am i missing? How can i get the http_request to process a page on another server (site). FYI, outside this application, my code as written works fine.

Thank you much for all the help.

 

sorry, you cantdo that
browsers wont allow that
(it would be both a security leak and cause lots of other problems if allowed)

 

Instead use CURL. Use AJAX to send XHR to the CURL script on ur server. Now let the CURL script return the responseText by fetching it from remote site!

 

cURL was my preferred solution, but not an option for this project. im looking into AJAX Cross-Domain Solution: proxy.php now.