How can you alter the name of attributes in a shortcode?

Question

function jk_WPSCEX_add_message( $atts )
{
   $output="<a href="" . $atts['link'] . '">' . $atts['text'] . '</a>';
   return $output;
}

using the above function shortcode is generated in the form of [jk link="http://jaskokoyn.com" text="Like me on Facebook"]

OR
For Enclosed type of shortcode:

function jk_WPSCEX_add_message( $atts, $content = null )
{
   $output="<a href="" . $atts['link'] . '">' . $content . '</a>';
   return $output; 
}

shortcode to be used is [jk link="http://jaskokoyn.com"]Like us on Facebook[/jk]