小窓を表示し、親窓から閉じる
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title></title> <script type="text/javascript"> var childWin; function oChild(){ childWin = window.open("dummy.html","","width=200,height=200"); } function cChild(){ childWin.close(); } //--> </script> </head> <body> <form> <input type="button" name="btnOpen" value="小窓を開く" onClick="oChild()"> <input type="button" name="btnClose" value="小窓を閉じる" onClick="cChild()"> </form> </body> </html>