function formatphone(field)
 {
    field.value = field.value.replace(/[^\d]*/gi,"");
    if ( field.value.length > 3 )
       field.value = "(" + field.value.substring(0,3) + ")" + field.value.substring(3);
    if ( field.value.length > 8)
       field.value = field.value.substring(0,8) + "-" + field.value.substring(8);

 }