var preloaded = [];

		for (var i = 1; i <= 7; i++) {
			preloaded[i] = [loadImage("dd_" + i + ".gif"), loadImage("dd_" + i + "_h.gif")];
		}

		function init() {
			if (mtDropDown.isSupported()) {
				mtDropDown.initialize();

				menu1.onactivate = function() { swapImage("but1", preloaded[1][1].src) };
				menu1.ondeactivate = function() { swapImage("but1", preloaded[1][0].src) };

				menu2.onactivate = function() { swapImage("but2", preloaded[2][1].src) };
				menu2.ondeactivate = function() { swapImage("but2", preloaded[2][0].src) };

				menu3.onactivate = function() { swapImage("but3", preloaded[3][1].src) };
				menu3.ondeactivate = function() { swapImage("but3", preloaded[3][0].src) };

				menu4.onactivate = function() { swapImage("but4", preloaded[4][1].src) };
				menu4.ondeactivate = function() { swapImage("but4", preloaded[4][0].src) };

				menu5.onactivate = function() { swapImage("but5", preloaded[5][1].src) };
				menu5.ondeactivate = function() { swapImage("but5", preloaded[5][0].src) };

				menu6.onactivate = function() { swapImage("but6", preloaded[6][1].src) };
				menu6.ondeactivate = function() { swapImage("but6", preloaded[6][0].src) };
				
				menu7.onactivate = function() { swapImage("but7", preloaded[7][1].src) };
				menu7.ondeactivate = function() { swapImage("but7", preloaded[7][0].src) };
			}
		}

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

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