Hello, yes, it is ! I’ve found this Sunday. I have modified in functions.php :
function slide( $atts, $content = null )
{
extract( shortcode_atts( array( ‘caption’ => ”, ‘url’ => ”, ‘src’ => ”, ‘target’ => ‘‘), $atts ) );

$caption_out = ”;

if ( $caption != ” ) { $caption_out = ” . $caption . ”; }

$url_out_begin = ”;
$url_out_end = ”;

if ( $url != ” )
{
$url_out_begin = ‘<a href="' . $url . '" target=”‘ .$target. ‘“>’;
$url_out_end = ‘‘;
}

$slide = ” . $url_out_begin . ” . $caption_out . $url_out_end . ”;

return $slide;
}

add_shortcode( ‘slide’, ‘slide’ );

And then, the code in my first message is ok !