var preloaded = [];

		for (var i = 1; i <= 5; i++) {
			preloaded[i] = [loadImage(i + "-0.gif"), loadImage(i + "-1.gif")];
		}

		function init() {
			//==========================================================================================
			if (mtDropDown.isSupported()) {
				mtDropDown.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) };
			}
		}

		function loadImage(sFilename) {
			var img = new Image();
			img.src ="../_images/nav/" + sFilename;
			return img;
		}

		function swapImage(imgName, sFilename) {
			document.images[imgName].src = sFilename;
		}