if (sco_id == null) return;
	public	final void IliasLaunchSco (String sco_id) {		if (sco_id == null) return;		if (isLaunched && sco_id.equals(IliasScoId)) {			say ("SCO " +sco_id +" is already running.");			return;		}		IliasScoCmi.clear();		say ("Launching sco " +sco_id);		if (isLaunched) say ("Sco "+IliasScoId +" will be unloaded.");		isLaunched = false;		IliasLaunchContent (			"../scorm_presentation.php?cmd=launchSco"			+"&sco_id=" + sco_id			+"&ref_id=" + IliasRefId		);		IliasNextScoId = sco_id;	}