WORDPRESS: replace login logo

// add a new logo to the login page
function login_logo() { ?>
    <style type="text/css">
        .login #login h1 a {
            background-image: url( '<?php bloginfo('template_url') ?>/img/logo.png' );
            background-size: 300px auto;
            height: 50px;
			filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(
			src='<?php bloginfo('template_url') ?>/img/logo.png',
			sizingMethod='scale');

			-ms-filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader(
			src='<?php bloginfo('template_url') ?>/img/logo.png',
			sizingMethod='scale')";
        }
		.login #nav a, .login #backtoblog a {
            color: #847754 !important;
        }
        .login #nav a:hover, .login #backtoblog a:hover {
            color: #3E3739 !important;
        }
		body.login{
			background: #ffffff !important;
		}
		p#backtoblog{
			display:none !important;
		}
		.login .button-primary {
			
		}
		.login .button-primary:hover {
			
		}
    </style>
<?php }
add_action( 'login_enqueue_scripts', 'login_logo' );