Added a button that toggles help text. Added simple validation for input fields so that no new tag will be saved blank. For the already saved tags, I created a form for each entry (placed the <form> tag inside the {foreach} loop). Otherwise, (with all elements nested within one <form>) it would delete only the last saved tag whether the selection.

git-svn-id: http://voronet.francu.com/repos/DEX@923 8d550267-2627-4c68-899f-85492a8dd5ca