var initWord = '検索したい商品を入力してください';

function searchBoxSet(){
	var searchBox = $('item_name');
	if( searchBox.value == '' ){
		searchBox.style.color = '#999999';
		searchBox.value = initWord;
	}
}

function onblurSearchWord(){
	var searchBox = $('item_name');
	if( searchBox.value == "" ){
		searchBox.style.color = '#999999';
		searchBox.value = initWord;
	}
}

function onfocusSearchWord(){
	var searchBox = $('item_name');
	if( searchBox.value == initWord ){
		searchBox.style.color = '#000000';
		searchBox.value = '';
	}
}

function onsubmitSearchWord(){
	var searchBox = $('item_name');
	if( searchBox.value == initWord ){
		return false;
	}else if( searchBox.value == '' ){
		return false;
	}
	return true;
}