function doSearch() {
    var oSearchBox = document.getElementById("searchbox");

    if (oSearchBox != null) {
        if (oSearchBox.value != "") {
            window.location = "search.aspx?t=" + oSearchBox.value;
        }
        else {
            alert("Please enter a seach phrase.");
        }
    }
}

function onEnterKey(e) {
    alert(e.keyCode)

    if (e.keyCode == 13) {
        doSearch();
    }
}