function isEmptyString(strValue)
{
    var strTestString = new String(strValue);
    if ( strValue == null || strTestString.length == 0 )
        return true;
    for (i = 0; i < strTestString.length; i++)
        if ( strTestString.charAt(i) != ' '  && strTestString.charAt(i) != '\t' &&
             strTestString.charAt(i) != '\n' && strTestString.charAt(i) != '\r' )
            return false;
    return true;
}

function swapImage(image_id, image_file)
{
    var image;

    image = document.getElementById(image_id);
    image.src = image_file;
}

function showFullPlan(image, text)
{
    var hWnd;
    hWnd = window.open("/service/showplan.html?image=" + image + "&text=" + text,"Plan","resizable=yes,scrollbars=yes,width=950,height=650");
}