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theideabulbFlag for United States of America

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Check for comma in textbox and how alert onSubmit

Just looking for some help on how to create a javascript that will check for a comma in a textbox and on submit or when the person goes to a new field that it will throw a warning to not use a comma in their value.  This is for currency, so many times, people entering values from Europe will enter in 23,99 instead of 23.99  and I also do not want 1,599.99 or 1,599,99
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Thank you.  almost good.  Try a number like this...   2,499,999.99.  It seems to be replacing the first comma with a period.  For the most part, it can just put up a message like. "Please do not use commas in your purchase price"
changes line 5 :
var noComma = function() {
    var obj = document.getElementById("c");
    if(obj.value.indexOf(",")) {
        alert("no comma");
        obj.value = obj.value.replace(/,/g,".");
        return false;
    return true;

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