function validate(){

name1			= document.Customer.elements[1].value;
email1			= document.Customer.elements[2].value;

name2			= document.Customer.elements[3].value;
email2			= document.Customer.elements[4].value;

// Advanced name1 validation...
var name1Filter=/^[A-Za-z0-9\s.,']+$/;
if (!(name1Filter.test(name1))) 
  { 
  alert("Please enter your name.\n\nAlpha-numeric characters only, please.");
  document.Customer.elements[1].focus();
  return false;
  }

// Advanced email1 validation...
var email1Filter=/^.+@.+\..{2,3}$/;
if (!(email1Filter.test(email1))) 
  { 
  alert("Please enter a valid email address.\n\nExample: yourname@AOL.com");
  document.Customer.elements[2].focus();
  return false;
  }


// Advanced name2 validation...
var name2Filter=/^[A-Za-z0-9\s.,']+$/;
if (!(name2Filter.test(name2))) 
  { 
  alert("Please enter your friend's name.\n\nAlpha-numeric characters only, please.");
  document.Customer.elements[3].focus();
  return false;
  }

// Advanced email2 validation...
var email2Filter=/^.+@.+\..{2,3}$/;
if (!(email2Filter.test(email2))) 
  { 
  alert("Please enter a valid email address for your friend.\n\nExample: yourname@AOL.com");
  document.Customer.elements[4].focus();
  return false;
  }

return true;
}