Function Render-Checkbox
(
render-checkbox < name > < checkedp > &key < id > (class
checkbox) )
Renders a checkbox in a form.
'name' - name of the html control. The name is attributized before
being rendered.
'checkedp' - if true, renders the box checked.
'id' - id of the html control. Default is nil.
'class' - a class used for styling. By default, submit.