function CheckSearch() {
    var lsRes;
    try{
        lsRes = $.trim($('#txtSearch').val());
	    if(lsRes == '' || lsRes == 'Search'){
		    $('#txtSearch').focus();
		    return false;
	    }
	    else{
            window.location = 'Search.aspx?key=' + lsRes;
		    return true;
		}
    }catch(ex){return true;}
}

function ClearSearch() {
    var lsRes;
    try{
        lsRes = $.trim($('#txtSearch').val());
	    if(lsRes == 'Tìm kiếm' || lsRes == 'Search'){
		    $('#txtSearch').val('');
	    }else
            $('#txtSearch').select();
    }catch(ex){}
}

$(document).ready(function () {
    try {
        $('#txtSearch').keydown(function (e) {
            if (e.keyCode == 13) {
                e.preventDefault();
                CheckSearch();
            }
        });
    } catch (ex) { }
});