寵物中心php/js一問

我於bank.php加了以下既code
$moneycredits1= $GLOBALS['extcredits'.$petsettings['moneycredits1']];
$moneycreditsname1=$extcredits[$petsettings['moneycredits1']][title];

禁我應該係bank.js 加咩code 先用到<span id="moneycredits1">

var moneycredits1=xmldoc.getElementsByTagName('moneycredits1')[0].firstChild.nodeValue;
$('moneycredits1').innerHTML=moneycredits1;
但用唔到=.=