if (!ajax_js)
{
	var ajax_js = true;
	/* 
	  *********************
	  * AJAX
	  *********************
	  */

	// primary function to reload a container with the contents of a new url. the action is here.
	// RETURNS
	//    true	if HTTP request was made
	//    false	if HTTP request failed
	// PARAMS
	//    id = container where data should be placed
	//   uri = uri of data to be fetched
	//   lid = id of status container. ajax_loader() will use this to put some message or image inside [OPTIONAL]
	//  oid = the id of some tag we want to perform an outerHTML on in case innerHTML fails [OPTIONAL]
	// content = the status message we wish to load into the container with id 'lid' [OPTIONAL]
	function update(id,uri,lid,oid,content)
	{
		var rv = true
		var request, e
		// 200 OK
		// XMLHttpRequest.open( method, URL, async, userName, password )
		//      The "async" parameter specifies whether the request should be handled asynchronously or not –
		//      "true" means that script processing carries on after the send() method, without waiting for a response, 
		//       and "false" means that the script waits for a response before continuing script processing.
		
		try
		{
			if (lid)
			{
				if (content)
				{
					ajax_loader(lid,'on',content)
				}
				else
				{
					ajax_loader(lid,'on')
				}
			}
		}
		catch (err)
		{
		}
		
		try
		{
			request = getXmlHttpObject()
			
			if (request == null)
			{
				return false
			}
				
			request.onreadystatechange	=	
				function()
				{
					try
					{
						if (	request.readyState==4  || request.readyState=="complete"	)
						{ 
							if (request.responseText)
							{
								e	= document.getElementById(id)
								if (e)
								{
									e.innerHTML	= request.responseText
								} // end element exists check
								if (lid)
								{
									ajax_loader(lid,'off')
								} // end if lid
							} // end if responseText
						} // end if readyState
					} // end try
					catch (err)
					{
						if (oid)
						{
							// innerHTML messed up. let's use outerHTML.
							e = document.getElementById(oid)
							if (e)
							{
								e.outerHTML = request.responseText
							} // end if e
							if (lid)
							{
								ajax_loader(lid,'off')
							} // end if lid
						} // end if oid
					} // end catch
				} // end function
				
			request.open("GET", uri, true)
			request.send('')
		
		}
		catch (err)
		{
			rv = false
			try
			{
				if (lid)
				{
					ajax_loader(lid,'off')
				}
			}
			catch (err)
			{
			}
		}
		
		return rv
	}

	function getXmlHttpObject(handler)
	{ 
		var objXMLHttp=null
		
		if (!window.XMLHttpRequest)
		{
			XMLHttpRequest = function()
				{
					// [Wikipedia] Here is a patch allowing direct invocation of XMLHttpRequest in browsers that don't supply one directly:
					try{ return new ActiveXObject("MSXML3.XMLHTTP") }catch(e){}
					try{ return new ActiveXObject("MSXML2.XMLHTTP.3.0") }catch(e){}
					try{ return new ActiveXObject("Msxml2.XMLHTTP") }catch(e){}
					try{ return new ActiveXObject("Microsoft.XMLHTTP") }catch(e){}
					throw new Error("Could not find an XMLHttpRequest alternative.")
				}
		}
		
		objXMLHttp=new XMLHttpRequest()	
		
		return objXMLHttp
	}
	
	// ajax_loader:		indicates the status of the HTTP request
	// PARAMS
	//	lid = id of status container
	//	status = on / off	(on = put some content in the status container, off = make the container blank)
	//	content = the content you want to load into the container (if left blank, default content will be used)
	function ajax_loader(lid,status,content)
	{
		try
		{
			var e = document.getElementById(lid)
			if (e)
			{
				if (status=="on")
				{
					// show the ajax loader animated gif
					if (content)
					{
						e.innerHTML = content
					}
					else
					{
						// default path of the animated gif  to be used
						e.innerHTML = "<img src=\"ajaxloader.gif\" />"
					}
				}	// end if status
				else
				{
					e.innerHTML = ""
				}	// end else
			} // end if e
		}
		catch (err)
		{
		}
	}
} // run once