function show_sub_menu(v_tr_name) {
var browser=navigator.appName
var objNotesRow = document.getElementById(v_tr_name);
hide_all_sub_menus();
objNotesRow.style.visibility = "visible";
    if (browser != 'Microsoft Internet Explorer')
    {
        objNotesRow.style.display = "table-row";
    }
    else
    {
        objNotesRow.style.display = "inline";
    }
}

function hide_all_sub_menus() {
var browser=navigator.appName

var objNotesHide1 = document.getElementById("home");
objNotesHide1.style.visibility = "hidden";
objNotesHide1.style.display = "none";

var objNotesHide2 = document.getElementById("vision");
objNotesHide2.style.visibility = "hidden";
objNotesHide2.style.display = "none";

var objNotesHide3 = document.getElementById("support");
objNotesHide3.style.visibility = "hidden";
objNotesHide3.style.display = "none";

var objNotesHide4 = document.getElementById("media");
objNotesHide4.style.visibility = "hidden";
objNotesHide4.style.display = "none";

var objNotesHide5 = document.getElementById("contact");
objNotesHide5.style.visibility = "hidden";
objNotesHide5.style.display = "none";


}