How to trim/short the title

Hi Guys

i Like to know how to trim / short the title for wordpress ecommerce

currently i am using
<?php echo wpsc_the_product_title(); ?> for ecommerce

for normal wordpress post and page i use

function short_title($after = '', $length) {
	$mytitle = get_the_title();
	if ( strlen($mytitle) > $length ) {
	$mytitle = substr($mytitle,0,$length);
	echo $mytitle . $after;
	} else {
	echo $mytitle;
	}
}

<?php short_title('...', 40); ?>