Commas messing with number input in Javascript

Use a global regular expression to replace all commas with an empty string:

var str = "12,345,678";
str = str.replace(/,/g, "");
parseInt(str, 10);

or even better

var s="jdjsghd0182.99";
var str = parseFloat(s.replace(/[^0-9 | ^.]/g, ''));

Or even better, given the general unreliability of user input, use this to get rid of all non-numeric characters:

var s = "9,Ljk876";
var t = parseInt(s.replace(/[^0-9]/g, ''));
alert ("s:" + s + ", t:" + t);

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