function showHideSpan(span_id, switcher){
    span = document.getElementById(span_id);
    if (!span.style.display || (span.style.display == 'none')){
        span.style.display = 'block';
        switcher.src = '/pict/minusblue.gif';
    }else{
        span.style.display = 'none';
        switcher.src = '/pict/plusblue.gif';
    }
    this.blur();
}

function hideSpan(span_id){
    span = document.getElementById(span_id);
    span.style.display = 'none';
}

function showSpan(span_id){
    span = document.getElementById(span_id);
    span.style.display = 'block';
    this.blur();
}