// Written by Michael Yun Zhou
	// Add listing Page Price Tip AJAX Client Side

    function addListingSupportRequest(url) 
	{
		url = url + '?year=' + document.add_listing.year.value + '&model_id=' + document.add_listing.model_id.value;
		//alert(url);
        var http_request = false;

        if (window.XMLHttpRequest) 
		{ // Mozilla, Safari, ...
            http_request = new XMLHttpRequest();
            if (http_request.overrideMimeType) 
			{
                http_request.overrideMimeType('text/xml');
                // See note below about this line
            }
        }
		 else if (window.ActiveXObject) 
		 { // IE
            try 
			{
                http_request = new ActiveXObject("Msxml2.XMLHTTP");
            } 
			catch (e) 
			{
                try 
				{
                    http_request = new ActiveXObject("Microsoft.XMLHTTP");
                } 
				catch (e) {}
            }
        }

        if (!http_request) 
		{
            alert('Giving up :( Cannot create an XMLHTTP instance');
            return false;
        }
        http_request.onreadystatechange = function() { displayContents(http_request); };
		
        http_request.open('GET', url, true);
        http_request.send(null);

    }

    function displayContents(http_request) 
	{

        if (http_request.readyState == 4) 
		{
            if (http_request.status == 200 && http_request.responseText != '') 
			{
                //alert(http_request.responseText);
				document.getElementById('price_tip_row').style.display = '';
				document.getElementById('price_tip_button').style.display = '';
				document.getElementById('avg_listing_status').style.display = '';
				document.getElementById('avg_listing_status').innerHTML = http_request.responseText;
            } 
			else
			{
				document.getElementById('price_tip_row').style.display = 'none';
				document.getElementById('price_tip_button').style.display = 'none';
				document.getElementById('avg_listing_status').style.display = 'none';
			
			}
			//else {
            //    alert('There was a problem with the request.');
            //}
        }

    }