function search_focus() {
    if (document.getElementById('searched_content').value == '請輸入關鍵字') {
	document.getElementById('searched_content').value = '';
    }
}

function search_blur() {
    if (document.getElementById('searched_content').value == '') {
	document.getElementById('searched_content').value = '請輸入關鍵字';
    }
}