Logo Problem

[Ahsan Ali]

Logo is not updating in socialize skin
i uploaded logo.png in socialize/style/logo.png
screen shot:


and its not updating

here is header template

	<div id="pageWrapper"><div class="pagePattern">
<div class="above_body"> <!-- closing tag is in template navbar -->
<div id="header" class="floatcontainer doc_header"><div class="pageWrap">
<div class="logoWrap">
			<vb:if condition="$stylevar['titleimage']"><a name="top" href="{vb:link forumhome}" class="logo"><img src="{vb:stylevar titleimage}" alt="{vb:rawphrase x_powered_by_vbulletin, {vb:raw vboptions.bbtitle}}" /></a></vb:if>
<vb:if condition="$vbulletin->options['socialize_slogan_enable']">
			<div class="slogan">
				{vb:raw socialize_slogan}
			</div>
</vb:if>
</div>

<vb:if condition="$vbulletin->options['display_social_icons']==1">
			<div class="socialBox"><div class="socialBoxWrap">		
			<vb:if condition="$vbulletin->options['facebook_account']"><a href="http://www.facebook.com/{vb:raw facebook_account}" target="_blank"><img src="{vb:stylevar imgdir_themedir}/icon-facebook.png" alt="Follow us on Facebook" /></a></vb:if>
			<vb:if condition="$vbulletin->options['twitter_account']"><a href="http://www.twitter.com/{vb:raw twitter_account}" target="_blank"><img src="{vb:stylevar imgdir_themedir}/icon-twitter.png" alt="Follow us on Twitter" /></a></vb:if>
			<vb:if condition="$vbulletin->options['youtube_account']"><a href="http://www.youtube.com/{vb:raw youtube_account}" target="_blank"><img src="{vb:stylevar imgdir_themedir}/icon-youtube.png" alt="Watch us on YouTube" /></a></vb:if>
			<vb:if condition="$vbulletin->options['myspace_account']"><a href="http://www.myspace.com/{vb:raw myspace_account}"><img src="{vb:stylevar imgdir_themedir}/icon-myspace.png" alt="My Space" /></a></vb:if>
			<vb:if condition="$vbulletin->options['linkedin_account']"><a href=" http://www.linkedin.com/pub/{vb:raw linkedin_account}"><img src="{vb:stylevar imgdir_themedir}/icon-linkedin.png" alt="Linked In" /></a></vb:if>
			<vb:if condition="$vbulletin->options['flickr_account']"><a href="http://www.flickr.com/photos/{vb:raw flickr_account}"><img src="{vb:stylevar imgdir_themedir}/icon-flickr.png" alt="Flickr" /></a></vb:if>
			</div></div>
</vb:if>
	<vb:if condition="$vboptions['enablefacebookconnect']">
	<div class="pure_facebook">
	<ul>
		{vb:raw facebook_header}
	</ul>
	</div>
	</vb:if>
</div></div>

How to change logo ?????????????????????