Hide Div tag using jquery

Hide Div tag using jquery

We have requirement like below.

<div class="content_block service_detail_block" style="display: none">
<h3></h3>
<div class="servive_description"></div>
<div class="service_requests"></div>
<div class="service_articles"></div>
<div class="mbutton">
<a class="button submit_service_request" href="make_request.do?">Report a problem with this Service &gt;</a>
</div>
</div>

we need to hide div class with mbutton when condition (temp == ' 1234') 
i have tried  like $('.mbutton').hide(); 
but it didn't work