fax number validation

I want to have a validation script for fax number.

1-111-111-1234 is valid number

Would you please help me how i can start?
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      <TITLE>Lakio Foxy validation script for fax numbers</TITLE>
function rule(fax){
return /^\d-\d{3}-\d{3}-\d{4}$/.test(fax);
<a href="#" onclick="alert( rule('1-111-111-1234') )">Test 1-111-111-1234 </a><br>
<a href="#" onclick="alert( rule('11-111-111-12341') )">Test 1-111-111-1234 </a>
<a href="javascript:;" onclick="alert( rule('1-111-111-1234') )">Test 1-111-111-1234 </a><br>
<a href="javascript:;" onclick="alert( rule('1-111-111-12341') )">Test 1-111-111-12341 </a><br>
<a href="javascript:;" onclick="alert( rule(prompt('Please enter your FAX.', '1-111-111-1234')) )">Test anything you like </a><br>
ZvonkoSystems architectCommented:
Here my proposal:

<title>Zvonko &#42;</title>
function checkForm(theForm){
  if(!theForm.fax.value.match(/^1[\ \-]?\d{3}[\ \-]?\d{3}[\ \-]?\d{4}$/)){
    alert("Please enter the FAX number in this format:\n\t1-999-999-9999");
    return false;
  return true;
<form onSubmit="return checkForm(this)">
<input type="text" name="fax" size="14" maxlength="14">
<input type="submit">


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 why not just focus()?

ZvonkoSystems architectCommented:
Open your own question and I can explain it to you ;-)
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