onclick in js
<input type="text" name="text" id="test" onmouseover="skriv('klick')"> <input type="button" name="send" value="Skicka" id="klick" onclick="skriv('test')"> <script src="lib/script.js"></script> // in lib/script.js function skriv(name) { document.getElementById(name).style.backgroundColor='red'; }