// JavaScript Document
function vacio(q) {
        for ( i = 0; i <q.length; i++ ) {
                if ( q.charAt(i) != " " ) {
                        return true
                }
        }
        return false
}
function valida(F) {
                if( vacio(F.zip.value) == false ) {
                alert("Please, Enter Your 5-Digit ZIP Code")
                return false
        } else {
                return true
        }       
}