var preloaded = [];

// here is a lame preloading script i am putting in just for demonstration
for (var i = 1; i <= 7; i++) {
	preloaded[i] = [loadImage(i + "-0.gif"), loadImage(i + "-1.gif")];
}

function init() {
	// whatever stuff you need to do onload goes here.

	//==========================================================================================
	// if supported, initialize dropdowns
	//==========================================================================================
	// Check isSupported() so that menus aren't accidentally sent to non-supporting browsers.
	// This is better than server-side checking because it will also catch browsers which would
	// normally support the menus but have javascript disabled.
	//
	// If supported, call initialize() and then hook whatever image rollover code you need to do
	// to the .onactivate and .ondeactivate events for each menu.
	//==========================================================================================
	if (DropDown.isSupported()) {
		DropDown.initialize();

		// hook all the image swapping of the main toolbar to menu activation/deactivation
		// instead of simple rollover to get the effect where the button stays hightlit until
		// the menu is closed.
		menu1.onactivate = function() { swapImage("button1", preloaded[1][1].src) };
		menu1.ondeactivate = function() { swapImage("button1", preloaded[1][0].src) };
				
		menu2.onactivate = function() { swapImage("button2", preloaded[2][1].src) };
		menu2.ondeactivate = function() { swapImage("button2", preloaded[2][0].src) };

		menu3.onactivate = function() { swapImage("button3", preloaded[3][1].src) };
		menu3.ondeactivate = function() { swapImage("button3", preloaded[3][0].src) };

		menu4.onactivate = function() { swapImage("button4", preloaded[4][1].src) };
		menu4.ondeactivate = function() { swapImage("button4", preloaded[4][0].src) };

		menu5.onactivate = function() { swapImage("button5", preloaded[5][1].src) };
		menu5.ondeactivate = function() { swapImage("button5", preloaded[5][0].src) };
				
		menu6.onactivate = function() { swapImage("button6", preloaded[6][1].src) };
		menu6.ondeactivate = function() { swapImage("button6", preloaded[6][0].src) };

		menu7.onactivate = function() { swapImage("button7", preloaded[7][1].src) };
		menu7.ondeactivate = function() { swapImage("button7", preloaded[7][0].src) };
	}
}

// this is a crappy example preloader. Use whichever one you want.
function loadImage(sFilename) {
	var img = new Image();
	img.src = "assets/nav/" + sFilename;
	return img;
}

// this is a crappy example image swapper. Use whichever you want.
function swapImage(imgName, sFilename) {
	document.images[imgName].src = sFilename;
}