function alertmsg() { alert("やあ"); } function addidmsg(ev) { var yaa_element = document.getElementById("yaa"); if (yaa_element) { yaa_element.innerHTML += " やあ"; } } function show(e) { var element = (e.target||ev.srcElement); element.style.backgroundColor = "white"; element.style.color = "black"; } function addAll() { var i, item; var checks = document.getElementsByTagName("span"); for (i=0; i<checks.length; i++) { item = checks[i]; if (item.getAttribute("class") == "check") { item.addEventListener("click", show, false); } } } window.onload = addAll;