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One approach is to provide a message that the form has been submitted, and then provide some means to prevent the web page reader from submitting the form again. In its simplest variation, the following would work:
function validateSubmission(evt) {
...
alert("Thank you, we're processing your order right now");
document.getElementById("submitbutton").disabled=true; // disable
Multiple concurrent form submissions are one of the worst problems that can occur in a user interface. Most people would be unhappy if, say, they found they had purchased two of the same item when they were only expecting to purchase one.
There are several different approaches you can take to prevent duplicate form submissions, and how strict you want to be depends on the seriousness of the double submission.
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