<!-- Javascript permits switching between tab contents - move to linked file if you prefer -->
// START tab script
// Adapted from "Javascript + CSS + DOM Magic" by Makiko Itoh

// define variables for "if n4 (Netscape 4), if IE (IE 4.x),
// and if n6 (if Netscape 6/W3C-DOM compliant)"

var n4, ie, n6;

// detect browser support for certain key objects/methods
// and assemble a custom document object

var doc,doc2,doc3,sty;

if (document.layers) {
        doc = "document.";
        doc2 = ".document.";
        doc3 = "";
        sty = "";
        n4 = true;
} else if (document.all) {
        doc = "document.all.";
        doc2 = "";
        doc3 = "";
        sty = ".style";
        ie = true;
} else if (document.getElementById) {
        doc = "document.getElementById('";
        doc2 ="')";
        doc3 ="')";
        sty = "').style";
        n6 = true;
}

// display block or none DIV element

function blocknone(divname,state) {
        if (n4) {
                divObj = eval (doc + divname);
        }
        else {
                divObj = eval (doc + divname + sty);
        }
        divObj.display = state;
}

// variables that hold the value of the currently active (open) menu

var active_submenu1 = null;
var active_submenu2 = null;
var active_menuelem = null;
var active_topelem = null;

// function closes all active menus and turns back to 'off' state

function closeallmenus() {
        if (active_submenu1 != null) {
                blocknone(active_submenu1,'none');
        }
        if (active_submenu2 != null) {
                blocknone(active_submenu1,'none');
        }
}

// the menu close timeout variable

var menu_close_timeout = 0;

// stop all timeout functions (stops menus from closing)

function stopall(tertmenuflag) {
        clearTimeout(menu_close_timeout);
}

// function controls submenus

function controlsubmenu(submenu1,submenu2) {
        stopall();
        closeallmenus();
        if (submenu1 != null) {
                blocknone(submenu1,'block');
                active_submenu1 = submenu1;
        }
        if (submenu2 != null) {
                blocknone(submenu2,'block');
                active_submenu2 = submenu2;
        }
}

//END guide tab script