function CAjax()
	{
	this.http             = null;
	this.modeXML          = false;
	this.after            = null;
	this.progressForm     = null;
	
	var me = this;

	this.setResponseXML = function(val)
		{
		this.modeXML = val ? true : false;
		if (window.ActiveXObject && this.http && this.http.overrideMimeType)
		this.http.overrideMimeType(this.modeXML ? 'text/xml' : 'text/html');
		};

	this.init = function()
		{
		if (window.XMLHttpRequest)
			{
			this.http = new XMLHttpRequest();
			}
		else if (window.ActiveXObject)
			{
			try
				{
				this.http = new ActiveXObject("Msxml2.XMLHTTP");
				}
			catch(e)
				{
				try { this.http = new ActiveXObject("Microsoft.XMLHTTP"); }
				catch(e){}
				}
			if (this.http && this.modeXML && this.http.overrideMimeType)
				this.http.overrideMimeType('text/xml');
			}
		};

	this.req = function(args/*hash || form*/,after/*function*/, url/*script url*/, post/*method*/, nocache)
		{
		this.showProgressForm();
		if (this.http == null)
			{
			this.init();
			if(this.http == null)
				{
				alert('Use another browser, please!');
				return false;
				}
			}
		this.after = after ? after : null;
		var method = args.method ? args.method : post ? 'post' : 'get';
		var action = args.action ? args.action : url;
		var qs = null;
		if (method=='post')
			{
			qs = this.getArgs(args);
			url = action;
			if (!nocache) url += '?rand='+Math.random();
			}
		else
			{
			url += '?'+this.getArgs(args);
			if (!nocache) url += '&rand='+Math.random();
			}
		this.http.open(method, url);
		if (method=='post' && typeof(this.http.setRequestHeader)!="undefined")
			{
			this.http.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
			}
		this.http.setRequestHeader("X-Requested-With", "XMLHttpRequest");
		if (this.after)
			{
			this.http.onreadystatechange = function()
			{
			if (me.http.readyState==4)
				{
				me.after(this.modeXML ? me.http.responseXML : me.http.responseText);
				me.hideProgressForm();
				}
			};
			}
		else
			{
				this.http.onreadystatechange = function()
				{
				if (me.http.readyState==4) me.hideProgressForm();
				};
			}
		this.http.send(qs);
		return false;
		};

	this.getArgs = function(args)
		{
		var url = '';
		if (args)
			{
			if (args.tagName=='FORM')
				{
				var elem = args.getElementsByTagName('INPUT');
				var len = elem.length;
				for(var j=0;j<len;j++)
					{
					if (!elem[j].name) continue;
					switch (elem[j].type.toUpperCase())
						{
						case 'CHECKBOX': case 'RADIO':
							{
							if (!elem[j].checked) continue;	break;
							}
						case 'BUTTON': case 'SUBMIT': case 'RESET': case 'IMAGE': case 'FILE':
							{
							continue; break;
							}
						}
					if (url.length>0) url += '&';
					url += encodeURIComponent(elem[j].name)+'='+encodeURIComponent(elem[j].value);
					}
				elem = args.getElementsByTagName('TEXTAREA');
				len = elem.length;
				for(var j=0;j<len;j++)
					{
					if (!elem[j].name) continue;
					if (url.length>0) url += '&';
					url += encodeURIComponent(elem[j].name)+'='+encodeURIComponent(elem[j].value);
					}
				elem = args.getElementsByTagName('SELECT');
				len = elem.length;
				for(var j=0;j<len;j++)
					{
					if (!elem[j].name) continue;
					if (elem[j].multiple)
						{
						var opt = elem[j].options;
							{
							var optlen = opt.length;
							for(var k=0;k<optlen;k++)
								{
								if (opt[k].selected)
									{
									if (url.length>0) url += '&';
									url += encodeURIComponent(elem[j].name)+'['+k+']='+encodeURIComponent(opt[k].value);
									}
								}
							}
						}
					else
						{
						if (url.length>0) url += '&';
						url += encodeURIComponent(elem[j].name)+'='+encodeURIComponent(elem[j].value);
						}
					}
				}
			else
				{
				if(typeof(args)=='object') for(var i in args)
					{					
					if (url.length>0) url += '&';
					url += encodeURIComponent(i)+'='+encodeURIComponent(args[i]);
					}
				else url = args;
				}
			}
		return url;
		};

	this.showProgressForm = function()
		{
		if (!this.progressForm) return;
		var x = parseInt(getClientWidth() / 2) + document.body.scrollLeft;
		var y = parseInt(getClientHeight() / 2) + document.body.scrollTop;
		if (!this.progressForm.offsetWidth)
			{
			this.progressForm.style.left = x+'px';
			this.progressForm.style.top = y+'px';
			this.progressForm.style.display = 'block';
			this.progressForm.style.left = (x - parseInt(this.progressForm.offsetWidth/2))+'px';
			this.progressForm.style.top = (y - parseInt(this.progressForm.offsetHeight/2))+'px';
			}
		else
			{
			this.progressForm.style.left = x - parseInt(this.progressForm.offsetWidth/2)+'px';
			this.progressForm.style.top = y - parseInt(this.progressForm.offsetHeight/2)+'px';
			this.progressForm.style.display = 'block';
			}
		};

	this.hideProgressForm = function()
		{
		if (me.progressForm) me.progressForm.style.display = 'none';
		};

	this.setProgressForm = function(innerHtml)
		{
		if (!this.progressForm)
			{
			if (!$('ajax_progress'))
				{
				var e = $$('DIV');
				e.style['display'] = 'none';
				e.style['position'] = 'absolute';
				e.id = 'ajax_progress';
				document.body.appendChild(e);
				}
			this.progressForm = $('ajax_progress');
			}
		if (innerHtml) this.progressForm.innerHTML = innerHtml;
		};

	this.dropProgressForm = function()
		{
		this.progressForm = null;
		};
}