using POST, but browser reverting to GET

[envexlabs]

Hey,

 

I have an image upload script that i'm trying to execute via AJAX, but my browser is giving me this error in the JS Console:

 

Warning: Form contains enctype=multipart/form-data, but does not contain method=post.  Submitting normally with method=GET and no enctype instead.

Source File: http://*********.com/store.php?store_id=1

Line: 0

 

my ajax.js file:

 

//AJAX POST

   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);
      slide_product();
   }

   function alertContents() {
      if (http_request.readyState == 4) {
         if (http_request.status == 200) {
            result = http_request.responseText;
            document.getElementById('store_contents').innerHTML = result;            
         } else {
            alert('There was a problem with the request.');
         }
      }
   }
   
   function get(obj) {
      var poststr = "pname=" + encodeURI( document.getElementById("pname").value ) +
                    "&price=" + encodeURI( document.getElementById("price").value ) +
                    "&desc=" + encodeURI( document.getElementById("desc").value ) +
                    "&cat_id=" + encodeURI( document.getElementById("cat_id").value ) +
                    "&pic=" + encodeURI( document.getElementById("pic").value ) +
                    "&store_id=" + encodeURI( document.getElementById("store_id").value );
      makePOSTRequest('inc/ajax/add_product.php', poststr);
      alert(poststr);
   }

 

Does anyone know how to fix this?