// JSONscriptRequest -- a simple class for accessing Yahoo! Web Services
// using dynamically generated script tags and JSON
//
// Author: Jason Levitt
// Date: December 7th, 2005
//
// A SECURITY WARNING FROM DOUGLAS CROCKFORD:
// "The dynamic <script> tag hack suffers from a problem. It allows a page 
// to access data from any server in the web, which is really useful. 
// Unfortunately, the data is returned in the form of a script. That script 
// can deliver the data, but it runs with the same authority as scripts on 
// the base page, so it is able to steal cookies or misuse the authorization 
// of the user with the server. A rogue script can do destructive things to 
// the relationship between the user and the base server."
//
// So, be extremely cautious in your use of this script.
//

// Constructor -- pass a REST request URL to the constructor
//
function JSONscriptRequest(fullUrl) {
    // REST request path
    this.fullUrl = fullUrl;
    // Keep IE from caching requests
    this.noCacheIE = '&noCacheIE=' + (new Date()).getTime();
    // Get the DOM location to put the script tag
    this.headLoc = document.getElementsByTagName("head").item(0);
    // Generate a unique script tag id
    this.scriptId = 'YJscriptId' + JSONscriptRequest.scriptCounter++;
}

// Static script ID counter
JSONscriptRequest.scriptCounter = 1;

// buildScriptTag method
//
JSONscriptRequest.prototype.buildScriptTag = function() {

    // Create the script tag
    this.scriptObj = document.createElement("script");

    // Add script object attributes
    this.scriptObj.setAttribute("type", "text/javascript");
    this.scriptObj.setAttribute("src", this.fullUrl + this.noCacheIE);
    this.scriptObj.setAttribute("id", this.scriptId);
}

// removeScriptTag method
// 
JSONscriptRequest.prototype.removeScriptTag = function() {
    // Destroy the script tag
    this.headLoc.removeChild(this.scriptObj);
}

// addScriptTag method
//
JSONscriptRequest.prototype.addScriptTag = function() {
    // Create the script tag
    this.headLoc.appendChild(this.scriptObj);

}

function callJSONScriptRequest(request) {
    // Create a new script object
    aObj = new JSONscriptRequest(request);
    // Build the script tag
    aObj.buildScriptTag();
    // Execute (add) the script tag
    aObj.addScriptTag();
}

/*
// Project: Zing Interaction
*/
//====================================================================//

/* create interaction object*/
Interaction_HitCounter = new Object();
Interaction_HitCounter.doman = 'http://interaction.zing.vn/';

Interaction_HitCounter.include = function(file)  
{     
   var script  = document.createElement('script');
   script.src = Interaction_HitCounter.doman + file;  
   script.type =  'text/javascript';  
   script.defer = true;  
   
   document.getElementsByTagName('head').item(0).appendChild(script);  
   
}

Interaction_HitCounter.include('javascript/HitCounter.js');