1 field easy Javascript or AJAX form validation -

1 field easy Javascript or AJAX form validation. Summary: I need to validate a single phone number field in a Paypal checkout form. 10 digits need to be entered in correct format for the form to continue. 10 digits need auto formatting during input. Numbers entered would be checked against a list of possible correct numbers. Needs on screen error message and also pop up message box. Details: Number field only allows the number in this format: 08-XXXX-XXXX. Requires 10 digits. 2 hyphens Error for not 10 digits: "Please enter your 10 Digit number starting with 08." (Form can not submit without a number in 10-digit format.) Please make this an onscreen error message next to the input box. Script should auto add the hyphen "-" at spot 3, and 8 during a users input. Please check the number begins with one of the numbers in the list below. If so, ok. If not, text display: "This service is only for AIS 1-2 Call. Are you sure your number is correct?" This would be pop up warning dialog box. Cancel: return to page OK: submit the form Notes: This script will need to run on a Word Press page. If you can stylize, would like to double the size of the input fields. First person to post to a completed script would be chosen as the project winner. Price expected: $30-50 This is the form: <form action="[login to view URL]" method="post"> <input name="cmd" type="hidden" value="_s-xclick" /> <input name="hosted_button_id" type="hidden" value="T48RXCJABBQQJ" /> <table> <tbody> <tr> <td><input name="on0" type="hidden" value="Credit Amount" />Credit Amount</td> </tr> <tr> <td><select name="os0"> <option value="100 Baht">100 Baht $5.99</option> <option value="200 Baht">200 Baht $9.50</option> <option value="300 Baht">300 Baht $12.99</option> <option value="400 Baht">400 Baht $16.50</option> <option value="500 Baht">500 Baht $19.99</option> <option value="800 Baht">800 Baht $29.99</option> </select></td> </tr> <tr> <td><input name="on1" type="hidden" value="AIS 12Call Phone Number:" />AIS 12Call Phone Number:</td> </tr> <tr> <td><input maxlength="10" name="os1" type="text" value="08" /></td> </tr> </tbody> </table> <input name="currency_code" type="hidden" value="USD" /> <input alt="PayPal - The safer, easier way to pay online!" name="submit" src="[login to view URL]" type="image" /> <img src="[login to view URL]" border="0" alt="" width="1" height="1" /> These are the numbers to check for: 080-00xxxx 081-0xxxxxx -___________ 081-170xxxx ~ 081-199xxxx 081-250xxxx ~ 081-299xxxx 081-350xxxx ~ 081-389xxxx 081-700xxxx ~ 081-709xxxx 081-720xxxx ~ 081-799xxxx 081-8xxxxxx -___________ 081-9xxxxxx -___________ 086-0xxxxxx -___________ 086-1xxxxxx -___________ 086-2xxxxxx -___________ 087-0xxxxxx -___________ 087-1xxxxxx -___________ 087-2xxxxxx -___________ 089-0xxxxxx -___________ 089-2xxxxxx -___________ 089-5xxxxxx -___________ 089-8xxxxxx -___________ 089-9xxxxxx -___________