Have a checkbox as follows:
Code:
<input type="checkbox" name="checkbox" OnClick="javascript:return ReadOnlyCheckBox()" />
Support the above with JavaSript as:
Code:
<script language="javascript" type="text/javascript">
function ReadOnlyCheckBox()
{
return false;
}
</script>
The above checkbox will not allow the user to change the state and even it will not appear in the Grey background (as Disabled).