【JavaScript】Yahooショッピングの検索窓

search_yahoo.js

function Form_Load() {
  if (this.searchForm.p.value.length > 0) {
    target = document.getElementById("clear_button");
    target.style.visibility = "visible";
  }
}

function ClearButton_Click() {
  this.searchForm.p.value = "";
  this.searchForm.p.focus();

  target = document.getElementById("clear_button");
  target.style.visibility = "hidden";
}

function ClearButton_KeyDown() {
  target = document.getElementById("clear_button");
  target.style.visibility = "visible";
}