function validateForm(form) { //This is the name of the function

if (form.email.value == " ") { //This checks to make sure the field is not empty
   alert("Please include your email address"); //Informs user of empty field
   form.email.focus( ); //This focuses the cursor on the empty field
   return false; //This prevents the form from being submitted
   }
// you may copy the above 5 lines for each form field you wish to validate
// Replace the text "FIELD1" with the name you wish to call the field
}