Editing Forum:Collapsing headers?

{{Forumheader|Help desk}}<!-- Please put your content under this line.  Be sure to sign your edits with four tildes: ~~~~ -->
Does anyone know of any way to make a header collapsable (is that a word)? I want to make it possible on the rosters on [[User:DatNuttyKid/Smash 5 Prediction!]] because the page is getting hard to read. <small>---Preceding unsigned comment added by [[Special:MyPage|you]]. Or maybe [[User:DatNuttyKid|DatNuttyKid]].</small>  00:02, 18 January 2016 (EST)
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Insert common text
Signature	~~~~
Symbols	£ ¥ ° ± × ÷ € ≈ ≠ ≤ ≥
Diacritics	À Á Â Ã Ä Å Æ Ç È É Ê Ë Ì Í Î Ï Ð Ñ Ò Ó Ô Õ Ö Ø Œ Ù Ú Û Ü Ý Þ ß à á â ã ä å æ ç è é ê ë ì í î ï ð ñ ò ó ô õ ö ø œ ù ú û ü ý þ ÿ
Wikitext	[] [[]] \| [[Category:]] [[File:]] #REDIRECT: [[]] {\| \|- \|\| \|}
Templates	{{cleanup}} {{image}} {{reflist}} {{stub}} {{d}} {{delete}}
Formatting	<!----> <br> <code></code> <gallery></gallery> <nowiki></nowiki> <ref></ref> <references/> {{#widget:YouTube\|id=}}
Substitution	<includeonly></includeonly> <noinclude></noinclude>