//declare
var submenu = new Array();
var tmr = new Array();
var adj = new Array();
var last_zIndex = 10000;


// EXAMPLE CONFIG
var menuWidth = 150;

//Work
submenu['menu1'] = new Array();
submenu['menu1'][0] = menuItem('Joseph','/work/joseph.htm');
submenu['menu1'][1] = menuItem('Nathalie','/work/nathalie.htm');
submenu['menu1'][2] = menuItem('Other folks','/work/ourteam.htm');
submenu['menu1'][3] = menuItem('Publications','/work/publications.htm');
submenu['menu1'][4] = menuItem('Collaborators','/work/collaborators.htm');
submenu['menu1'][5] = menuItem('Study Sites','/work/studysites.htm' );
submenu['menu1'][6] = menuItem('Latest News','/work/latestnews/latest.htm' );
	

//Images
submenu['menu2'] = new Array();
submenu['menu2'][0] = menuItem('Natural History','/pictures/natural.htm');
submenu['menu2'][1] = menuItem('Landscapes','/pictures/landscapes.htm');
submenu['menu2'][2] = menuItem('People','/pictures/people.htm');
submenu['menu2'][3] = menuItem('Copyright','/pictures/copyright.htm');

//Sounds
submenu['menu3'] = new Array();
submenu['menu3'][0] = menuItem('Birds','/sounds/birds/birds.htm');
submenu['menu3'][1] = menuItem('Mammals','/sounds/mammals/mammals.htm');
submenu['menu3'][2] = menuItem('Copyright','/sounds/copyright.htm');

//Conservation
submenu['menu4'] = new Array();
submenu['menu4'][0] = menuItem('The Birds of Bolivia','/projects/birdsofbolivia.htm');
submenu['menu4'][1] = menuItem('Expeditions','/projects/expeditions.htm');

//About
submenu['menu6'] = new Array();
submenu['menu6'][0] = menuItem('Nathalie','/about/nathalie.htm');
submenu['menu6'][1] = menuItem('Joseph','/about/joseph.htm');
submenu['menu6'][2] = menuItem('Where are we?','/about/wherearewe.htm');
submenu['menu6'][3] = menuItem('Useful links','/about/links.htm');



// END OF EXAMPLE CONFIG


//build or unhide submenu div...
function buildSubmenu(obj){
	//get common part of div id
	menuPath = obj.id.split('_');
	
	//unset mousout of parent menus and make sure they are visible...
	x = "div";
	for(i=0;i<menuPath.length;i++){
		x+= '_' + menuPath[i];
		if(document.getElementById(x)){
			if(tmr[x])
				window.clearTimeout(tmr[x]);
			document.getElementById(x).style.visibility = 'visible';
		}
	}
	
	//check if we have a submenu of the obj...
	if(submenu[obj.id]){
		//check if allready build...
		c = document.getElementById('div_' + obj.id);
		if(c){
			//unhide...
			c.style.visibility = 'visible';
			c.style.zIndex = last_zIndex++; 
		}else{
			//calc position of mouseover
			d = obj;
			if(d){
				L_pos = d.offsetLeft + d.offsetWidth - 1;
				T_pos = d.offsetTop - 0;
				while(d.offsetParent){
					d = d.offsetParent;
					L_pos+= d.offsetLeft;
					T_pos+= d.offsetTop;
				}
			}

			//patch first submenu to go right below the main buttons...
			if(obj.className.indexOf('menuItem') < 0){
				L_pos-= obj.offsetWidth;
				T_pos+= obj.offsetHeight;
			}
			
			//build new div
			subObj = document.createElement('div');
			subObj.id = 'div_' + obj.id;
			subObj.className = 'submenu';
			subObj.style.position = 'absolute';
			subObj.style.zIndex = last_zIndex++;
			subObj.style.width = menuWidth;
			subObj.style.top = T_pos + 'px';
			subObj.style.left = L_pos + 'px';
	
			//write div to the body...
			document.getElementsByTagName('body')[0].appendChild(subObj);	
			
			//build html for submenu
			content = "";
			m = submenu[obj.id];
			for(i=0;i<m.length;i++){
				//determin target
				if(!m[i][2]){
					tar = 'self';
				}else{
					//get javascript target (not tested yet)
					tar = "window.frames['"+tar+"']";
				}
				
				//make item
				content+= "<div onmouseout=\"hideSubmenu(this)\" onmouseover=\"buildSubmenu(this)\" "+ (m[i][1] ? "onclick=\""+tar+".location.href='" + m[i][1] + "'\" " : "") +"class=menuItem" + (i==0 ? 'First' : '') + " id=\"" + obj.id + "_" + i +"\">" + m[i][0] + "</div>";
				adj[i] = obj.id + "_" + i;
			}
			
			//insert new menu
			subObj.innerHTML = content;
			
			//make all just made div's the same width...
			for(i=0;i<adj.length;i++)
				document.getElementById(adj[i]).style.width = subObj.style.width;
		}
	}
}

//hide a submebu div
function hideSubmenu(obj){
	//get common part of div id
	closePath = obj.id.split('_');

	//hide path
	x = "div";
	for(i=0;i<closePath.length;i++){
		x+= '_' + closePath[i];
		if(document.getElementById(x))
			tmr[x] = window.setTimeout("document.getElementById('"+x+"').style.visibility = 'hidden';",050);
		//The timeout above is needed for MSIE browsers... Or else the menu's will disapear on EVERY mousout!!!
		//Please get a normal browser like Firefox, Mozilla or Opera!!
	}
}

//add an menu item to the config array (called in the config lines)
function menuItem(txt,url,tar){
	return new Array(txt,url,tar);
}

//*** Now a patch for MSIE lag of CSS2 compliance!!
if(navigator.userAgent.indexOf('MSIE')>=0 && navigator.userAgent.indexOf('Opera')==-1){
	document.onmouseover = function(){
		obj = event.srcElement;
		if(obj.className == 'menuItem' || obj.className == 'menuItemFirst')
			obj.className+='Over';
	}
	document.onmouseout = function(){
		obj = event.srcElement;
		if(obj.className == 'menuItemOver' || obj.className == 'menuItemFirstOver')
			obj.className = obj.className.substring(0,(obj.className.length - 4));
	}
}