// Ajax Library

function createREQ()
{
	try
	{
		req = new XMLHttpRequest(); /* e.g. Firefox */
	}
	catch(err1)
	{
		try
		{
			req = new ActiveXObject('Msxml2.XMLHTTP'); /* some versions IE */
		}
		catch(err2)
		{
			try
			{
				req = new ActiveXObject("Microsoft.XMLHTTP"); /* some versions IE */
			}
			catch(err3)
			{
				req = false;
			}
		 }
	 }
	 
     return req;
}

function requestGET(url, query, req)
{	
	myRand=parseInt(Math.random()*99999999);
	req.open("GET",url+'?'+query+'&rand='+myRand,true);
	req.send(null);
}

function requestPOST(url, query, req)
{
	req.open("POST", url,true);
	req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	req.send(query);
}

function doCallback(callback,item)
{	
	//alert(item);
	if(callback.indexOf('(') == (callback.indexOf(')') - 1) || callback.indexOf('(')  < 0)
	{
		callback = callback  + '(item)';
	}
	else
	{
		arrCallback = callback.split(')');
		arrCallback['0'] = arrCallback['0'] + ', item)';
		callback = arrCallback['0'];
	}
	eval(callback);
}

function doAjax(url,query,callback,reqtype,option,getxml)
{	
	// create the XMLHTTPRequest object instance
	var myreq = createREQ();

	myreq.onreadystatechange = function()
	{
		if(myreq.readyState == 4)
		{
			if(myreq.status == 200)
			{
				var item = myreq.responseText;
				if(getxml==1)
				{
					item = myreq.responseXML;
				}
				doCallback(callback, item);
			}
		}
		else
		{
			var item;
			if(option=='1')
			{
				item = '<img src="images/ajax_loader.gif" title="Loading..." alt="Loading..." />';	
				doCallback(callback, item);
			}
			else if(option=='2')
			{
				item = '<img src="common/images/ajax_loader.gif" title="Loading..." alt="Loading..." style="float:none" />';	
				doCallback(callback, item);
			}
			else
			{
				item = '';
			}
		}
	}
	if(reqtype=='post')
	{
		requestPOST(url,query,myreq);
	}
	else
	{
		requestGET(url,query,myreq);
	}
}