function preloadImage(imgSrc) {
	if(document.images) {
		imageDummy = new Image();
		imageDummy.src = imgSrc;
	}
}

function performMouseAction(theTD, mouseOver, imgName, imgSrc) {
	if(mouseOver) {
		theTD.style.cursor='hand';	
		theTD.className='menu_sub_mouseover';
	}
	else theTD.className='menu_sub';

	var theImg = document.getElementById(imgName);
	theImg.src = imgSrc;
}