function view_chart(metal)
{
   var options = 'height=370,width=485,status=no,toolbar=no,menubar=no,location=no,';
       options = options + 'resizable=no,scrollbars=no,titlebar=no,left=200,top=100';

   var url = '/charts/chart.php?metal=' + metal + '&time=today';

   metal_window = window.open(url, 'metal_window', options);
   metal_window.focus();
}