function showServices( services_id )
{
    var content  = document.getElementById( 'content' ) ;
    var selected = document.getElementById( services_id ) ;

    var captions = document.getElementById( 'captions' ) ;
    var caption  = document.getElementById( 'caption_' + services_id ) ;

    for ( var i = 0; i < content.childNodes.length; i++ )
    {
        content.childNodes[i].className = "hide" ;
    }
    selected.className = "show" ;

    for ( var j = 0; j < captions.childNodes.length; j++ )
    {
        captions.childNodes[j].className = "hide" ;
    }
    caption.className = "show" ;

    document.getElementById( 'services_photo' ).src  = "http://independentdrama.com/imgs/services_" + services_id + ".jpg" ;
    document.getElementById( 'services_text' ).className = "hide" ;
}