$(el).money([number][, options]);
number : if you want to replace what's inside your selected node - leave blank if you want to manipulate what's in the node
options : Object containing settings for commas and currency symbol. (default to true and "$")
{ comma : [true/false], symbol : [true/false/'€'/'£'] }
var cost = $('<span>')
$cost.money((300.234 + 34.234324),{ commas: true, symbol: "£" });
cost.appendTo("#total");
<span>£334.47</span>
is appended to <div id="total"> </div>
.