/*
Author   : bieler batiste
Company  : doSimple : http://www.dosimple.ch
send me a mail for more informations : faden@PASDEPOURRIELaltern.org - remove ( PASDEPOURRIEL )

Short javascript function to create and handle a CSS navigation menu

Copyright (C) 2004  Bieler Batiste

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

// the timeout for the menu
var timeout = 1000;
var navImages = new Array();

// not very clean but simple
// the function can be run in the HTML for faster display
// window.onload=initMenu;

// this fonction apply the CSS style and the event
function initMenu(prefix)
{
    // a test to avoid some browser like IE4, Opera 6, and IE Mac
    if ( browser.isDOM1 
    && !( browser.isMac && browser.isIE ) 
    && !( browser.isOpera && browser.versionMajor < 7 )
    && !( browser.isIE && browser.versionMajor < 5 ) )
    {
        // get some element
        var menu = document.getElementById('menu'); // the root element
        var lis = menu.getElementsByTagName('li'); // all the li
        
        // change the class name of the menu, 
        // it's usefull for compatibility with old browser
        menu.className='menu';
        
        // i am searching for ul element in li element
        for ( var i=0; i<lis.length; i++ )
        {
			// improve IE key navigation
			if ( browser.isIE )
			    addAnEvent(lis.item(i),'keyup',show);
			
			// link events to list item
			addAnEvent(lis.item(i),'mouseover',show);
			addAnEvent(lis.item(i),'mouseout',timeoutHide);
			addAnEvent(lis.item(i),'blur',timeoutHide);
			addAnEvent(lis.item(i),'focus',show);
               
               // create a timeout variable
			id = lis.item(i).getAttribute("id");
		    eval("window.timeout" + id + " = false;");

			// preload the images
			navImages[id] = new Array();
			navImages[id]['off'] = new Image();
			navImages[id]['off'].src = prefix + id + '.gif';
			navImages[id]['on'] = new Image();
			navImages[id]['on'].src = prefix + id + '-r.gif';
 
			lis.item(i).getElementsByTagName('a')[0].className = 'menuIndicateur';
        }
    }
}

function addAnEvent( target, eventName, functionName )
{
    // apply the method to IE
    if ( browser.isIE )
    {
        //attachEvent dont work properly with this
        eval('target.on'+eventName+'=functionName');
    }
    // apply the method to DOM compliant browsers
    else
    {
        target.addEventListener( eventName , functionName , true ); // true is important for Opera7
    }
}
    
// hide the first ul element of the current element
function timeoutHide()
{
    // start the timeout
    eval( "timeout" + this.id + " = window.setTimeout('hideUlUnder( \"" + this.id + "\" )', " + timeout + " );");
}

// hide the ul elements under the element identified by id
function hideUlUnder( id )
{   
	obj = document.getElementById(id);
	if (obj.getElementsByTagName('img').length)
		obj.getElementsByTagName('img')[0].src = navImages[id]['off'].src;
	if (obj.getElementsByTagName('ul').length)
	    obj.getElementsByTagName('ul')[0].style['visibility'] = 'hidden';
}

// show the first ul element found under this element
function show()
{
    // show the sub menu
	if (this.getElementsByTagName('img').length)
		this.getElementsByTagName('img')[0].src = navImages[this.id]['on'].src;
	if (this.getElementsByTagName('ul').length)
	    this.getElementsByTagName('ul')[0].style['visibility'] = 'visible';
   	// clear the timeout
    eval ( "clearTimeout( timeout"+ this.id +");" );
	hideAllOthersUls( this );
}

// hide all ul on the same level of  this list item
function hideAllOthersUls( currentLi )
{
    var ul = currentLi.parentNode;
    //alert(lis.childNodes.length);
    for ( var i=0; i<ul.childNodes.length; i++ )
    {
        if ( ul.childNodes[i].id && ul.childNodes[i].id != currentLi.id )
            hideUlUnderLi( ul.childNodes[i] );
    }
}

// hide all the ul wich are in the li element
function hideUlUnderLi( li )
{
	if (li.getElementsByTagName('img').length)
		li.getElementsByTagName('img')[0].src = navImages[li.id]['off'].src;
    var uls = li.getElementsByTagName('ul');
    for ( var i=0; i<uls.length; i++ )
        uls.item(i).style['visibility'] = 'hidden';
}