function verifyFields(){

var ValidChars = "0123456789";
        
        var Char;
        var returnBool;

     if ((document.member.zip.value.length < 5) && (document.member.zip.value.length > 0))
    {
        alert("please enter a correct zip code length" );
        document.member.zip.focus();
         returnBool = false;
        
    }
  else if(document.member.firstName.value == "" || document.member.lastName.value == "") {
        alert("Please enter your  first and last name");
        document.member.firstName.focus();
        returnBool = false;
        
    }

     else if(document.member.email.value != document.member.emailcheck.value ) {
        alert("your email addresses do not match");
        document.member.email.focus();
         returnBool = false;
      
    }
    else if(document.member.passwordCheck.value != document.member.password.value) {
        alert("your passwords do not match");
        document.member.password.focus();
       returnBool = false;
      
    }


   else if(document.member.email.value == "" || document.member.password.value == "") {
        alert("Please enter a valid email and password");
        document.member.email.focus();
         returnBool = false;      
    }
else{
 for (i = 0; i < document.member.zip.value.length; i++)
        {
           Char = document.member.zip.charAt(i);
          if (ValidChars.indexOf(Char) == -1)
        {
            alert("please enter a correct zip code with only number");
            document.member.zip.focus();
           returnBool = false;

           }
        }
    }
        return returnBool;
}