var preloaded = [];
for (var i = 1; i <= 4; i++) {
preloaded[i] = [loadImage('images/topmenu_' + i + '_nl.gif'), loadImage('images/topmenu_' + i + '_nl.gif')];
}
function init() {
	mtDropDown.initialize();	// whatever stuff you need to do onload goes here.
	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) };			
	//menu8.onactivate = function() { swapImage("button8", preloaded[8][1].src) };
	//menu8.ondeactivate = function() { swapImage("button8", preloaded[8][0].src) };			
	//menu9.onactivate = function() { swapImage("button9", preloaded[9][1].src) };
	//menu9.ondeactivate = function() { swapImage("button9", preloaded[9][0].src) };			
	//menu10.onactivate = function() { swapImage("button10", preloaded[10][1].src) };
	//menu10.ondeactivate = function() { swapImage("button10", preloaded[10][0].src) };			
	//menu11.onactivate = function() { swapImage("button11", preloaded[11][1].src) };
	//menu11.ondeactivate = function() { swapImage("button11", preloaded[11][0].src) };			
}
function loadImage(sFilename) {
	var img = new Image();
	img.src =sFilename;
	return img;
}
function swapImage(imgName, sFilename) {
	document.images[imgName].src = sFilename;
}