XMLHttp = function() 
{
	var self = this;
	try
	{    
		// Firefox, Opera 8.0+, Safari    
		self.xmlHttp = new XMLHttpRequest();    
	}
	catch (e)
	{    
		// Internet Explorer    
		try
		{      
			self.xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");      
		}
		catch (e)
		{      
			try
			{        
				self.xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");        
			}
			catch (e)
			{        
				alert("Your browser does not support AJAX!");       
				return false;       
			}
		}    
	}  
}


XMLHttp.prototype.get = function(url) 
{
	var self = this;
  self.xmlHttp.open('GET', url, true);
  self.xmlHttp.onreadystatechange = function() 
  {
	 self.processRequest();
	}
  self.xmlHttp.send(null);
}


XMLHttp.prototype.post = function(url, params) 
{
	var self = this;
	
	self.xmlHttp.open("POST", url, true);
	self.xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	self.xmlHttp.setRequestHeader("Content-length", params.length);
	self.xmlHttp.setRequestHeader("Connection", "close");
	
  self.xmlHttp.onreadystatechange = function() 
  {
		self.processRequest();
	}
  self.xmlHttp.send(params);
}


XMLHttp.prototype.processRequest = function() 
{
	var self = this;
  if (self.xmlHttp.readyState == 4) 
  {
		if (self.xmlHttp.status != 200) 
		{
	 	 self.resp = 'Error : Status '+ this.status + ' returned.';
		} 
		else 
		{
			if (self.xmlHttp.getResponseHeader("content-type") == null)
				self.rest = 'null';

			else if (self.xmlHttp.getResponseHeader("content-type").indexOf('text/xml') >= 0) 
				self.resp = 'xml';

			else if (self.xmlHttp.getResponseHeader("content-type").indexOf('text/html') >= 0 || self.xmlHttp.getResponseHeader("content-type").indexOf('text/plain') >= 0) 
				self.resp = 'text';

			else 
				self.resp = 'unknown content type';
		  self.response();
		}
  }
}