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// change login page logo image
function my_login_head() {
	?>
	<style>
		body.login #login h1 a {
			background: url(<?= get_bloginfo('template_url'); ?>/images/logo.png) no-repeat scroll center top transparent;
			height: 60px;
			width: 330px;
		}
	</style>
	<?php
}
add_action("login_head", "my_login_head");