Looping through input fields for validation using Jquery each()

Well testing here this works just fine:

$(function() {
    $("#submit").click(function() {
        $("#myForm input[type=text]").each(function() {
            if(!isNaN(this.value)) {
                alert(this.value + " is a valid number");
            }
        });
        return false;
    });
});

on a form looking like this:

<form method="post" action="" id="myForm">
    <input type="text" value="1234" />
    <input type="text" value="1234fd" />
    <input type="text" value="1234as" />
    <input type="text" value="1234gf" />
    <input type="submit" value="Send" id="submit" />
</form>

Move the return false around as you see fit

Edit: link to code sdded to OPs form http://pastebin.com/UajaEc2e

The value is a string. You need to try to convert it to a number first. In this case a simple unitary + will do the trick:

if (!isNaN(+this.value)) {
  // process stuff here
}