関数 click(e) {
if (document.all) {
if (event.button==1||event.button==2||event.button== 3) {
oncontextmenu='return false';
}
}
if (document.layers) {
if (e.that == 3) {
oncontextmenu=' return false';
}
}
}
if (document.layers) {
document.captureEvents(Event.MOUSEDOWN);
}
document.onmousedown=click ;
document .oncontextmenu = new Function("return false;")