With closure compiler: function hide(a){if(a=document.getElementById(a))a.style.visibility="hidden"}function vote(a){var b=a.id.split(/_/)[1];hide("up_"+b);hid

With closure compiler: function hide(a){if(a=document.getElementById(a))a.style.visibility="hidden"}function vote(a){var b=a.id.split(/_/)[1];hide("up_"+b);hide("down_"+b);(new Image).src=a.href;return!1}; v and item are merged. http://closure-compiler.appspot.com/home#code%3D%252F%252F%2520%253D%253DClosureCompiler%253D%253D%250A%252F%252F%2520%2540output_file_name%2520default.js%250A%252F%252F%2520%2540compilation_level%2520SIMPLE_OPTIMIZATIONS%250A%252F%252F%2520%253D%253D%252FClosureCompiler%253D%253D%250A%250Afunction%2520hide%28id%29%2520%257B%250A%2520%2520%2520%2520var%2520el%2520%253D%2520document.getElementById%28id%29%253B%250A%2520%2520%2520%2520if%2520%28el%29%2520%257B%2520el.style.visibility%2520%253D%2520%27hidden%27%253B%2520%257D%250A%2520%2520%257D%250A%2520%2520function%2520vote%28node%29%2520%257B%250A%2520%2520%2520%2520var%2520v%2520%253D%2520node.id.split%28%252F_%252F%29%253B%250A%2520%2520%2520%2520var%2520item%2520%253D%2520v%255B1%255D%253B%250A%2520%2520%2520%2520hide%28%27up_%27%2520%2520%2520%252B%2520item%29%253B%250A%2520%2520%2520%2520hide%28%27down_%27%2520%252B%2520item%29%253B%250A%2520%2520%2520%2520var%2520ping%2520%253D%2520new%2520Image%28%29%253B%250A%2520%2520%2520%2520ping.src%2520%253D%2520node.href%253B%250A%2520%2520%2520%2520return%2520false%253B%250A%2520%2520%257D http://closure-compiler.appspot.com/home#code%3D%252F%252F%2... Original Size: 212 bytes gzipped (318 bytes uncompressed) Compiled Size: 164 bytes gzipped (182 bytes uncompressed)