function aisatu() {
    alert("やあ");
}

function alertmsg() {
    alert("こんにちは");
}

function addidmsg(ev) {
    var kadai_element = document.getElementById("hello");
    if (kadai_element) {
	kadai_element.innerHTML += " こんにちは";
    }
}

function red() {
var color=document.getElementById("color")
color.style.backgroundColor = "white";document.getElementById("color").style.color  = "black";}

function are() {
var douzo=document.getElementById("douzo")
douzo.style.backgroundColor = "white";document.getElementById("douzo").style.color  = "black";}

function hutatu() {
var douzoda=document.getElementById("douzoda")
douzoda.style.backgroundColor = "white";document.getElementById("douzoda").style.color  = "black";}