function clearText(field){
  if (field.defaultValue == field.value) {
    field.value = '' ;
    changeTo(field) ;
  }
  else {
    field.value = field.defaultValue ;
    changeBack(field)
  }
}

function changeTo(element) {
  element.style.border ='1px solid #848484';
  element.style.color ='#808285';
  element.style.backgroundColor ='white';
}

function changeBack(element) {
  element.style.border ='1px solid #D8D8D8';
  element.style.color ='#E6E6E6';
  element.style.backgroundColor ='white';
}