var serNoChecked=""; function changeCheckBox() { try { var max = document.mainForm.option.length; var count = 0; for (var i = 0; i < max; i++) { if (document.mainForm.option[i].checked == true) { count++; serNoChecked = i; } } if (count == 1) { for (var i = 0; i < max; i++) { if (document.mainForm.option[i].checked == false) { document.mainForm.option[i].disabled = true; } } } else if (count == 0) { for (var i = 0; i < max; i++) { document.mainForm.option[i].disabled = false; } } if (null == max) return false; if (count == 0)
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