How to insert checkbox of categories in Wiki Front end editor?

Hello,

I want to change the selector of categories at front end editor(in wiki plugin).

Now, to select categories, select box is appeared.

<select name=’incsub_wiki_category’ id=’incsub_wiki_category’ class=” >

But then,User can only select one category.

He can’t select plural categories at the same time.

So, I want to change that to checkbox.

like this.

<input type=”checkbox” name=’incsub_wiki_category’ id=’incsub_wiki_category’ class=”>….

May be, wiki plugin’s front end editor uses TinyMCE,But I don’t find the part of that.

What files do I have to change?

(Hopefully, I want to use plugin to do that.)