javascript - Show/hide div when checkbox is selected

I would like to show/hide a div when a single checkbox is selected. It currently works with "Select all" but I can't get it to work with a single checkbox. Here's the code for "Select All":

JS:

HTML:

Select all

I'd like to display the div "mail_delete_button" when a single checkbox is selected and hide it when there's nothing checked. Note: My html/input field is in the form "messageform" This is my input code:

Any help would be greatly appreciated! Thanks! :)