WordPress Iframe Shortcode

gistfile1.php

function mux_iframe($atts, $content = null) {
	extract( shortcode_atts( 
		array(
			'width' => '558',
			'height' => '250',
			'overflow' => 'hidden',
			'scrolling' => 'no',
			'frameborder' => '0'
 		), $atts)
	);
 	
	return '<iframe style="overflow: '. $overflow .';" src="'. do_shortcode( $content ).'" height="'. $height .'" width="'. $width .'" frameborder="'. $frameborder .'" scrolling="'. $scrolling .'"></iframe>';
}
add_shortcode("iframe", "mux_iframe");