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<input onkeyup="this.value=this.value.replace(/\D/g, '');" onblur="this.value=this.value.replace(/\D/g, '');" type="text">
function myKeyDown() {
var k = window.event.keyCode;
if ((k == 46) || (k == 8) || (k == 189) || (k == 109) || (k == 190) || (k == 110) || (k >= 48 && k <= 57) || (k >= 96 && k <= 105) || (k >= 37 && k <= 40))
{ }
else if (k == 13) {
window.event.keyCode = 9;
}
else {
window.event.returnValue = false;
}
}