ShortCode in PHP?

Im trying to use the easy-contact plugin in the footer of my wordPress blog.

But I can’t work out how to do it, as it only supports shortCode.

What i’ve found in the plugin:

// Register the shortcode to the function ec_shortcode()
add_shortcode( 'easy-contact', 'ec_shortcode' );

Which must mean that [easy-contact] = ec_shortcode()

If I add ec_shortcode() to my footer I get this error:
Warning: Missing argument 1 for ec_shortcode(),
So I check how the function looks cause im obviously not passing it the right variable:

// Finds [easy-contact] shortcode and produces the form in the content
function ec_shortcode($attr) {
	global $ec_form_fields;
	// If we're processing $POST data without a problem, let's send an email
	if ( ec_check_input() ) {
...etc...

By the looks of it I need to do this ec_shortcode($attr), but $attr isn’t mentioned any where else in the entire plugin…
What is it? What do i need to send to this function?