function goSearch() {
        var keyword = trim(g("txt_keyword").value);

        if (keyword == "") {
            g("txt_keyword").focus();
            alert("关键词不能为空！");
            return false;
        }
        else {
            window.location = "/searchok.aspx?keyword=" + URLencode(keyword);
        }
        return false;

    }
    function g(eid) {
        return document.getElementById(eid);
    }

    //    document.onkeypress = function() {
    //        if (event.keyCode == 13) {
    //            document.getElementById("btn_search").click();
    //            return false; //返回false避免页面提交。
    //        }
    //    }



    //兼容ie和firefox
    document.onkeypress = function(eventTag) {
        var event = eventTag || window.event;
        var currentKey = event.charCode || event.keyCode;
        var eventSource = event.srcElement || eventTag.target;
        //        alert(eventSource.id);
        //        alert("abc");


        if (currentKey == 13) {
            if (eventSource.id == 'txt_keyword') {
                return goSearch();
            }
            else if (eventSource.id == 'btn_search') {
                return goSearch();
            }

            //return false;//返回false避免页面提交。
        }
    }