fix bug in safari browsers

svncommit

2006-02-19 f108b9c786a7a76525bd291d3ae1b74c77dd6a01

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<div id="taskbar">
<roundcube:button command="mail" label="mail" class="button-mail" />
<roundcube:button command="addressbook" label="addressbook" class="button-addressbook" />
<roundcube:button command="settings" label="settings" class="button-settings" />
<roundcube:button command="logout" label="logout" class="button-logout" />
</div>