var keyDown = 0;
function Down(){
if(++keyDown%2) {
 document.forms.chekey.d.value = "◇" ; }
else {
 document.forms.chekey.d.value = "◆" ; }
}
var keyPress = 0;
function Press(){
if(++keyPress%2) {
 document.forms.chekey.p.value = "◇" ; }
else {
 document.forms.chekey.p.value = "◆" ; }
}
var keyUp = 0;
function Up(){
if(++keyUp%2) {
 document.forms.chekey.u.value = "◇" ; }
else {
 document.forms.chekey.u.value = "◆" ; }
}
document.write("<form name=\"chekey\" action=\"\">");
document.write("<p>キーイベント確認欄：<br />");
document.write("<input type=\"text\" size=\"40\" name=\"a\" onkeydown=\"Down();\" onkeyup=\"Up();\" onkeypress=\"Press();\" />");
document.write("</p>");
document.write("<table>");
document.write("<tr>");
document.write("<th>onkeydown</th>");
document.write("<th>onkeypress</th>");
document.write("<th>onkeyup</th>");
document.write("</tr>");
document.write("<tr>");
document.write("<td style=\"text-align:center;\"><input type=\"text\" name=\"d\" readonly=\"readonly\" style=\"font-size:300%; width:1.1em; text-align:center;\"></td>");
document.write("<td style=\"text-align:center;\"><input type=\"text\" name=\"p\" readonly=\"readonly\" style=\"font-size:300%; width:1.1em; text-align:center;\"></td>");
document.write("<td style=\"text-align:center;\"><input type=\"text\" name=\"u\" readonly=\"readonly\" style=\"font-size:300%; width:1.1em; text-align:center;\"></td>");
document.write("</tr>");
document.write("</table>");
document.write("</form>");