Preloader on the backend wordpress

im trying to insert preloader on wordpress when user login, ,when user enter above url and login to site,preloader is load with image which is exactly as i wanted but i want this preloader to stay at least for 5sec so that user could read the message in preloader, and next issues is that after login to dashboard, every dashboard menu i click its load preloader which i dont want,i want preloader to load for just once for 5sec when user login, i dont want preloader to load everytime when dashboard menu is clicked.(Hope i have made my issue clear)

add_action( 'admin_head', 'dashboard_preloader' );
function dashboard_preloader()
<script type="text/javascript">

jQuery(window).load(function() { 

style="width: 100%; 
height: 780px;
position: absolute; 
z-index: 9999; 
center center; 
margin: 10px 0px 0px 0px; 
background-image: url(<?php echo get_stylesheet_directory_uri();?>/images/7.jpg); 
background-repeat: no-repeat; 
left: 0; 
background-size: cover;
top: 10px;">&nbsp;</div>

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