Function Render-Checkbox

Part of:

package weblocks
( 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”.