function onFocusInput(inputElem){
    if(inputElem.value == '在此输入关键字')
        inputElem.value = '';
}

function onBlurInput(inputElem){
    if(inputElem.value.blank())
        inputElem.value = '在此输入关键字';
}

function checkSearchForm(frm){
    if(frm.keywords.value.blank() || frm.keywords.value == '在此输入关键字'){
        $('search_error_msg').innerHTML = '请输入查询关键字';
        $('search_error_msg').show();
        return false;
    }else
    {
        return true;
    }
}