input颜色的变化onBlurInput onFocusInput

<script>
function onFocusInput(element) {
 if (element.value==element.defaultValue)
 {
  element.value='';
  element.style.color = '#000000';
 }
}

function onBlurInput(element) {
 if (element.value=='')
 {
  element.value=element.defaultValue
  element.style.color = '';
 }
}
</script>
      <div id="findInputBottomBox"><input type="text" autocomplete="off" maxlength="255"  onblur="onBlurInput(this);" onfocus="onFocusInput(this);"   value="请输入关键字" name="query" id="findInputBottom" ></div><div id="findBtnBottomBox"><button name="" id="findSubmitBottom"></button></div>