var http_request = false;

//------------------------------------------------------------------------------
function makePOSTRequest(url, parameters)
{
      http_request = false;
      if (window.XMLHttpRequest) { // Mozilla, Safari,...
         http_request = new XMLHttpRequest();
         if (http_request.overrideMimeType) {
         	// set type accordingly to anticipated content type
            //http_request.overrideMimeType('text/xml');
            http_request.overrideMimeType('text/html');
         }
      } 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('Cannot create XMLHTTP instance');
         return false;
      }
      
      http_request.onreadystatechange = alertContents;
      http_request.open('POST', url, true);
      http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      http_request.setRequestHeader("Content-length", parameters.length);
      http_request.setRequestHeader("Connection", "close");
      http_request.send(parameters);
   }

//------------------------------------------------------------------------------
function alertContents()
{
      if (http_request.readyState == 4)
	  {
         if (http_request.status == 200)
		 {
            //alert(http_request.responseText);
            result = http_request.responseText;
            
            var res_parts = result.split("||");
            
            if (res_parts[0] == "approved")	// forward to cart
            {
            	document.data_form.tfunction.value = "add_to_cart";
            	document.data_form.submit();

			}
			else	// show message
			{
	            document.getElementById('results_layer').innerHTML = res_parts[1];
			}            
         }
		 else		// forward to cart
		 {
            alert('There was a problem with the request.');
         }
      }
}
   
//------------------------------------------------------------------------------
function get(obj)
{
	// show the "loading" icon
	el = document.getElementById('results_layer');
	el.innerHTML = "<img src='/layer_template/images/ajax-loading.gif' width=32 height=32>";
	el.style.display = "block";
	
	// build the form request
	var poststr = "";
	
	var theForm = document.data_form;

	for(i=0; i<theForm.elements.length; i++)
	{

		if(theForm.elements[i].type == "text" || theForm.elements[i].type == "textarea" || theForm.elements[i].type == "button" || theForm.elements[i].type == "hidden")
		{
			poststr += theForm.elements[i].name+"="+encodeURI(theForm.elements[i].value)+"&";
		}
      	else
  		if(theForm.elements[i].type == "radio")
		{
			if (theForm.elements[i].checked == true)
			{
				poststr += theForm.elements[i].name+"="+theForm.elements[i].value+"&";
			}
		}
      	else
  		if(theForm.elements[i].type == "checkbox")
		{
			poststr += theForm.elements[i].name+"="+encodeURI(theForm.elements[i].checked)+"&";
		}
		else 
		if (theForm.elements[i].type == "select-one")
		{
			poststr += theForm.elements[i].name+"="+encodeURI(theForm.elements[i].options[theForm.elements[i].selectedIndex].value)+"&"
		}
		
   }	
					
	// post the ajax request
	
	makePOSTRequest('_generate/post.php', poststr);
    //makePOSTRequest('post.php', poststr);
}

//------------------------------------------------------------------------------