/**
*** modified 1 oct 2008 by ted koterwas: this is a bit of a kludge, but will 
*** prevent the menu from appearing if there are no items in the menu.
*** i've wrapped the statement for showing the menu in it's own function and added logic
*** to check the number of items in the corresponding data set 
*** the problem, of course, is that it relies implicitly on the datasets being loaded first. it
*** would probably be better to send the number of items in the dataset as an argument
*** but that would require changing scripts on every single page.
*/

function hideAllMenus(){
	hideMenu('play');
	hideMenu('ponder');
	hideMenu('about');
	hideMenu('mind_site');
	}

function rolloverMenu(button){
	hideMenu('play');
	hideMenu('ponder');
	hideMenu('about');
	hideMenu('mind_site');

	MM_swapImage(button,'','../../../images/'+button+'_btn_ro.jpg',1);

	showMenu(button)
	
	}
	
function rolloverMenuTopLevel(button){
	hideMenu('play');
	hideMenu('ponder');
	hideMenu('about');
	hideMenu('mind_site');

	MM_swapImage(button,'','images/'+button+'_btn_ro.jpg',1);

	showMenu(button)
	
	}
	
	
function rolloverMenuLevel1(button){
	hideMenu('play');
	hideMenu('ponder');
	hideMenu('about');
	hideMenu('mind_site');
	
	MM_swapImage(button,'','../images/'+button+'_btn_ro.jpg',1);

	showMenu(button)
}

function showMenu(button){

	var itemCount = 0;
	
	switch (button){
		case 'play':
			itemCount = (playSection.getData().length)?playSection.getData().length:0;
			break;
		case 'ponder':
			itemCount = (ponderSection.getData().length)?ponderSection.getData().length:0;
			break;
		case 'about':
			itemCount = (aboutSection.getData().length)?aboutSection.getData().length:0;
			break;
		case 'mind_site':
			itemCount = (mind_siteSection.getData().length)?mind_siteSection.getData().length:0;
			break;
	}

	if (itemCount > 0){
		var thisMenu = button+"Menu";
		document.getElementById(thisMenu).style.display = "block";
	}
}
	
function hideMenu(button){
	MM_swapImgRestore();
	var button = button;
	var thisMenu = button+"Menu";
	document.getElementById(thisMenu).style.display = "none";
	
}


hideMenu('play');
hideMenu('ponder');
hideMenu('about');
hideMenu('mind_site');