<html>
<a href="#">Show Forms</a>
<form action="#" method="post" class="activate-share">
<h1>This is form 1 and no other content should be shown</h1>
<input type="checkbox" class="activate-share" value="1" />
<div class="hidden-share" style="display: none;">I should be hidden</div>
</form>
<form action="#" method="post" class="activate-share">
<h1>This is form 2 and other content should be shown</h1>
<input type="checkbox" class="activate-share" checked="checked" value="1" />
<div class="hidden-share">I should be shown </div>
</form>
</html>
CSS
form {
display:none;
margin:10px;
border:1px solid black;
}