I have a form validation script that runs perfect. Now i want to add one more field to the form and want to make some fields "required" but i dont know how to do this. Please help me.
I am unable to write the code below as this forum is not allowing me to post more than 10000 letters. So i am attaching the relevant files. Thanks in advance.

Fields that i need to add:
1.Social Security Number (Same format as Home Telephone, but 3 digits allowed in the first filed, 2 in the 2nd and 4 in the 3rd field. (123)-(12)-(1234))

Fields that i need to make "required" :
1. Email
2. Social Security Number
3. First Name
4. Last Name