How to delete comma between tags?

Hi,

at the bottom of a single post is the tag list; how can I delete the comma between these tags?

See screenshot here: http://screencloud.net/v/6eUX

I’m not so familiar with PHP: where can I delete there this comma in “includes” – “loop-index.php”?

//tags on single post
            	if(has_tag())
            	{
                	echo '<span class="blog-tags minor-meta">';
                	the_tags('<strong>'.__('Tags','avia_framework').'</strong><span> ');
                	echo '</span></span>';
            	}

Thank you.