function numbersonly(myfield, e, dec)
{
    var key;
    var keychar;

    if (window.event)
        key = window.event.keyCode;
    else if (e)
            key = e.which;
    else
        return true;
    keychar = String.fromCharCode(key);

    // control keys
    if ((key==null) || (key==0) || (key==8) ||
        (key==9) || (key==13) || (key==27) )
        return true;

    // numbers
    else if ((("0123456789").indexOf(keychar) > -1))
            return true;

    // decimal point jump
    else if (dec && (keychar == "."))
    {
        myfield.form.elements[dec].focus();
        return false;
    }
    else
        return false;
}

function image(img)
{
    document.forms['form1'].image_font.src = 'font_image/'+img+'.gif'
}