A way to judge Checkbox and Radio_Form special effects

<title>Judge Checkbox and Radio - 51windows.Net</title> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <form method="post" name="myformname1"> <input type="checkbox" name="checkname1" id="c11" value=""><label for="c11">Choose 1</label> <input type="checkbox" name="checkname1" id="c12" value=""><label for="c12">Choose 2</label> <input type="checkbox" name="checkname1" id="c13" value=""><label for="c13">Choose 3</label> <input type="checkbox" name="checkname1" id="c14" value=""><label for="c14">Choose 4</label> <input type="button" onclick="alert(IsChecked(document.myformname1,'checkname1'))" value="娴"> </form>