Good_or_Bad_Image.user.js

// ==UserScript==
// @name         Good or bad image
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  'w' or 'up' for top, 's' or 'down' for bottom, autosubmit 
// @author       slothbear
// @include      *.mturkcontent.com/*
// @include      https://s3.amazonaws.com/mturk_bulk/*
// @require http://code.jquery.com/jquery-2.1.0.min.js
// @grant GM_log
// ==/UserScript==

// 'w' or 'up arrow' selects top option
// 's' or 'down arrow' selects bottom option
// 'enter' submits

var submitOnSelect = true; // 'true' submits on selection, 'false' doesn't

$(document).ready(function() {
	window.focus();

	$(document).keydown(function(e){
		switch(e.which){
			case 87: //w for top choice
			case 68: // i for top choice
			case 38: // up arrow for top choice
			case 97: // keypad 1 
				$("input[value='good']").click();
				//$("input[value='yes']").click();
				submitOnSelection();
				break;
			case 83: // s for bottom choice 
			case 75: // k for bottom choice
			case 40: // down arrow for bottom choice
			case 98: // keypad 2
				$("input[value='bad']").click();
				//$("input[value='no']").click();
				submitOnSelection();
				break;
			case 88: // x for 'not a whatever'
			case 99: // keypad 3
				$("input[value='not_salad']").click();
				submitOnSelection();
				break;
			case 13: // enter for submit
				submitOnSelection();
				break;
			default: return;
		}
		e.preventDefault();
	});

	function submitOnSelection(){
		if(submitOnSelect){
			$("input[value='Submit']").click();
		}
	}
})();