var current_expand_id = '';

function expand_accordion(new_expand_id) {
	
	
	// first, check to make sure they have not clicked
	// on the same link that is already open. If so
	// just ignore the click
	if(current_expand_id == new_expand_id) {
		return;
	}
	if(current_expand_id != '') {
		$(current_expand_id).slideUp(300);
	} else {
		// we don't know which one it is, so just close all of them
		$("#knowledge_content").hide();
		$("#after_content").hide();
		$("#design_content").hide();
		$("#about_content").hide();
	}
	$(new_expand_id).slideDown(300);
	current_expand_id = new_expand_id;
	
}