#Usage: $("#id-of-button/link").showHide($("#id-of-hidden-fields-container", options);

#Default options: hideText: 'close'
the text to show on the close link below the popup field

hideIdPrefix: 'close',
prefix to add to the id of the close button

hideClass: 'showHide-close'
class to add to the close button

activeClass: 'showHide-button-active'
class of activated button

replaceSubject: false
replace the button? -- this is useful for select lists where you don't want to replace it if user has no js

replaceClass: 'showHide-button'
class to add to the replacement button

replaceWithText: 'options'
Text on the replacement button

dropdown: false
Is it a dropdown? (just adds an arrow to the button)