diff --git a/core/instruct0.html b/core/instruct0.html
index ef237b5..52e1d53 100644
--- a/core/instruct0.html
+++ b/core/instruct0.html
@@ -3,4 +3,4 @@
 <br><br>
 <div> Please enter a unique subject identifier; No more than 30 characters, alphanumeric only. </div>
 <br>
-<input type="submit" value="Submit Subject ID" onclick='console.log("test");loadInstructions("one");'>
+<input type="submit" value="Submit Subject ID" onclick='loadInstructions("one");'>
diff --git a/core/js/IAT.js b/core/js/IAT.js
index 8cd3717..3ebedd1 100644
--- a/core/js/IAT.js
+++ b/core/js/IAT.js
@@ -4,7 +4,7 @@ sub = '';
 function randomString(length) {
 	var chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
     var result = '';
-    for (var i = length; i > 0; --i) result += chars[Math.round(Math.random() * (chars.length - 1))];
+    for (var i = length; i > 0; --i) result += chars.charAt(Math.floor(Math.random() * (chars.length - 1)));
     return result;
 }