function ajaxHelpful(vote,review_id)
{
	var ajax=true;
	var xmlHttp;
	try
	{
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
	}
	catch (e)
	{
		// Internet Explorer
		try
		{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			try
			{
				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e)
			{
				ajax=false;
			}
		}
	}
	xmlHttp.onreadystatechange=function()
	{
		if(xmlHttp.readyState==4)
		{
			var item_id=review_id;
			var reply = xmlHttp.responseText;
				//alert(reply);
			if(reply.indexOf('rtg:')>-1)
			{
				var new_rtg = reply.substring(reply.indexOf('rtg:')+4);
				var new_votes = new_rtg.substring(new_rtg.indexOf(',')+1);
				new_rtg = new_rtg.substring(0,new_rtg.indexOf(','));
				document.getElementById('hvotes_'+item_id).innerHTML=new_votes;
				document.getElementById('hrtg_'+item_id).innerHTML=new_rtg;
			}
			else if(reply.indexOf('error:')>-1)
			{
				var err_code = reply.substring(reply.indexOf('error:')+6);
				if(err_code==1){}
			}
		}
	}
	if(ajax)
	{
		xmlHttp.open("GET","/ajax_helpful.aspx?vt=" + vote + "&review_item=" + review_id,true);
		xmlHttp.send(null);

	}
}