//
// JSHttpRequest v1.12. (C) Dmitry Koterov, 2005-01-27. 
// http://forum.dklab.ru/users/DmitryKoterov/
//
// Do not remove this comment if you want to use script!
// �� ������� ������ �����������, ���� �� ������ ������������ ������!
//
function JSHttpRequest() {}
(
  function() 
  {
	  var count       = 0;
	  var pending     = {};
	  var cache       = {};
	  var spanReuse   = null;
	  
	  // Uncomment if you want to switch on <SCRIPT> reusing.
	  // But be carefull: seems FireFox does not work with reusing correctly
	  // (long delay on fast data reloading via existed <SCRIPT>).
	  //spanReuse   = [];
	
	  // Called by server script on data load.
	  JSHttpRequest.dataReady = function(id, text, js) 
	  {
	    var undef;
	    var th = pending[id];
	    if (th) 
	    {
	      if (th.caching) cache[th.hash] = [text, js];
	      th._dataReady(text, js);
	    } 
	    else if (typeof(th) != typeof(undef)) 
	    {
	      alert("ScriptLoader: unknown pending id: "+id);
	    }
	  }
	  
	  JSHttpRequest.prototype = 
	  {
	    // Standard properties.
	    onreadystatechange: null,
	    readyState: 0,
	    responseText: null,
	    responseXML: null,
	    status: 200,
	    statusText: "OK",
	    // Additional properties.
	    responseJS: null, 
	    caching: false,
	    SID: null,
	    // Internals.
	    _span: null,
	    _id: null,
	      
	    abort: function() 
	    { 
	    	with (this) 
	    	{
	    	  readyState = 0;
	    	  if (onreadystatechange) onreadystatechange();
	    	  _cleanupScript();
	    	  delete pending[_id];
	    	}
	    },
	      
	    open: function(method, url, asyncFlag, username, password) 
	    {
	      if ((""+method).toLowerCase() != 'get') 
	      {
	        alert('Only GET method is supported!');
	        return false;
	      }
	      this.url = url;
	      return true;
	    },
	    
	    send: function(content) 
	    {
	      var id = count++;
	      var query = [];
	      if (content instanceof Object) 
	      {
	        for (var k in content) 
	        {
	          query[query.length] = escape(k) + "=" + escape(content[k]);
	        }
	      } 
	      else 
	      {
	        query = [content];
	      }
	      var qs = query.join('&');
	      query = id + ':' + (this.SID || '') + ':' + qs;
	      var href = this.url + (this.url.indexOf('?')>=0? '&' : '?') + query;
	      var hash = this.url + '?' + qs;
	      this.hash = hash;
	      if (this.caching && cache[hash]) 
	      {
	        var c = cache[hash];
	        this._dataReady(c[0], c[1]);
	        return false;
	      }
	      this._obtainScript(id, href);
	      return true;
	    },
	
	    getAllResponseHeaders: function() 
	    {
	      return '';
	    },
	      
	    getResponseHeader: function(label) 
	    {
	      return '';
	    },
	
	    setRequestHeader: function(label, value) 
	    {
	    },
	    
	    //
	    // Internal functions.
	    //
	
	    _dataReady: function(text, js) 
	    { 
	    	with (this) 
	    	{
		      if (text !== null || js !== null) 
		      {
		        readyState = 4;
		        responseText = responseXML = text;
		        responseJS = js;
		      } 
		      else 
		      {
		        readyState = 0;
		        responseText = responseXML = responseJS = null;
		      }
		      if (onreadystatechange) onreadystatechange();
		      _cleanupScript();
	   		}
	    },
	
	    _obtainScript: function(id, href) 
	    { 
	    	with (document) 
	    	{
	      		var span = null;
	      		if (spanReuse == null || !spanReuse.length) 
	      		{
	        		span = body.appendChild(createElement("SPAN"));
	        		span.style.display = 'none';
	        		span.innerHTML = 'Text for stupid IE.<script></' + 'script>';
	      		} 
	      		else 	
	      		{
	       		 	span = spanReuse[spanReuse.length-1];
	       	 		spanReuse[spanReuse.length-1] = null;
	        		spanReuse.length--;
	      		}		
	      		pending[id] = this;
	      		setTimeout(function() 
	      		{
	        		var s = span.getElementsByTagName("script")[0];
	        		s.language = "JavaScript";
	        		if (s.setAttribute) s.setAttribute('src', href); else s.src = href;
	      		}, 10);
	  	   		this._id = id;
	  	    	this._span = span;
	    	}
	    },
	
	    _cleanupScript: function() 
	    {
	      var span = this._span;
	      if (span) 
	      {
	        this._span = null;
	        setTimeout(function() 
	        {
	          if (spanReuse != null) 
	          {
	            spanReuse[spanReuse.length] = span;
	          } 
	          else 
	          {
	            // without setTimeout - crash in IE 5.0!
	            span.parentNode.removeChild(span);
	          }
	        }, 50);
	      }
	      //window.status = document.body.childNodes.length + " - " + (spanReuse? spanReuse.length : 'no span reusing')
	      return false;
	    }
	  }

  }
)();