function switch_excerpt_visible(my_id)
{ 
	var elem = document.getElementById(my_id);
	var str = elem.className;
   
	if (str.indexOf('hide') > -1)
	{
		elem.className = str.replace('hide', 'show');
	}
	else
	{
		elem.className = str.replace('show', 'hide');
	}
}