function jsSwitchViaVisibility( open )
{
    if( !document.getElementById )
        return;

    if( open )
    {
        document.getElementById( "via_sib" ).style.display = "none";
        document.getElementById( "via_tab" ).style.display = "";
    }
    else
    {
        document.getElementById( "via_sib"  ).style.display = "";
        document.getElementById( "via_tab" ).style.display = "none";
    }
}

function jsSwitchExtendVisibility( open )
{
    if( !document.getElementById )
        return;

    if( open )
    {
        document.getElementById( "extend_tab" ).style.display = "";
    }
    else
    {
        document.getElementById( "extend_tab" ).style.display = "none";
    }
}

function toggleMSGVisibility( open )
{
    if( !document.getElementById )
        return;

    if( open )
    {
        document.getElementById( "additional_msg_more" ).style.display = "none";
        document.getElementById( "additional_msg_less" ).style.display = "";
    }
    else
    {
        document.getElementById( "additional_msg_more"  ).style.display = "";
        document.getElementById( "additional_msg_less" ).style.display = "none";
    }
}

function jsSwitchProblemVisibility( open )
{
    if( !document.getElementById )
        return;

    if( open )
    {
        document.getElementById( "problem_sib" ).style.display = "none";
        document.getElementById( "problem_tab" ).style.display = "";
    }
    else
    {
        document.getElementById( "problem_sib"  ).style.display = "";
        document.getElementById( "problem_tab" ).style.display = "none";
    }
}