function swapImage(imgName,newImg)
{
 eval('document.' + imgName + '.src = "' + newImg + '"');
}

function pop_up_win(url, name, s, w, h)
{
    popupWin = window.open(url, name, 'resizable=0,top=20,left=20,menubar=0,width=' + w + ',height=' + h);
}