function toggleSpan(span_id)
{
    var currentSpan = document.getElementById(span_id);
    
    //alert(currentSpan.style.display);
    if (currentSpan.style.display == "none")
    {
        currentSpan.style.display = "block";
    }
    else
    {
        currentSpan.style.display = "none";
    }
}

function hideSpan(span_id)
{
    var currentSpan = document.getElementById(span_id);
    currentSpan.style.display = "none";
}

function showSpan(span_id)
{
    var currentSpan = document.getElementById(span_id);
    currentSpan.style.display = "block";
}