grey out submit button on success

js/speccy.js

@@ -1069,7 +1069,9 @@ function submitVIinfo(){
 	var success_text = "Success!"; 
 	if (XHR.responseText.substring(0, success_text.length) === success_text) {
 	    //add a pip to the submission button
-	    document.getElementById("submitButton").value += ".";
+	    button = document.getElementById("submitButton");
+            button.value += ".";
+            button.style.background = "rgba(128,128,128,0.5)";  //grey out the button
 	} else {
 	    alert('Error! Something went badly wrong when submitting your results (see console for details).');
 	    console.log(XHR.responseText); //debug output for those who are interested