function toggle_elements_display(arg_id_1, arg_id_2)
{
	if ( typeof arg_id_1 == 'object' && typeof arg_id_2 == 'object' )
	{
		// Loop thrrough arg_id_1 and show all divs in the array (object ).
		for ( var i=0; i < arg_id_1.length; i++ )
		{
			$(arg_id_1[i]).style.display = 'block';				
		}
		for ( var i=0; i < arg_id_2.length; i++ )
		{
			$(arg_id_2[i]).style.display = 'none';				
		}
	}
	else if ( typeof arg_id_1 == 'string' && typeof arg_id_2 == 'string' )
	{
		if ( $(arg_id_1).style.display == 'none' )
		{
			$(arg_id_1).style.display = 'inline';
			$(arg_id_2).style.display = 'none';
		}
		else
		{
			$(arg_id_1).style.display = 'none';
			$(arg_id_2).style.display = 'inline';		
		}
	}
	else
	{
		alert ( 'Parameters must be either all objects or all strings' );
	}
}