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jQuery('.loading').fadeOut();

<header class="clearfix">
	<span class="loading"><img src="images/ajax-loader.gif" alt=""></span>
</header>

.loading
	position absolute
	background #2a2a2a
	z-index 999
	height 100%
	width 100%
	left 0
	img 
		width auto
		position absolute
		top 0
		left 0
		right 0
		bottom 0
		margin auto