function rollover_image(imgSrc) {
	if (-1 == imgSrc.indexOf('_over')) {
		return [	false,
			imgSrc.substring(0, imgSrc.lastIndexOf('.')),
			imgSrc.substring(imgSrc.lastIndexOf('.'))
			];
		} else {
		return [	true,
			imgSrc.substring(0, imgSrc.lastIndexOf('_over')),
			imgSrc.substring(imgSrc.lastIndexOf('.'))
			]
		}

	}

function rollover_onload(imgO) {
	imgPath = rollover_image(imgO.src);
	imgNew = imgPath[1] + '_over' + imgPath[2];

	(new Image()).src = imgNew;
	}

function rollover_action(imgO) {

	imgPath = rollover_image(imgO.src);
	newSrc = imgPath[1] + ((imgPath[0])?'':'_over') + imgPath[2];
	if (newSrc.indexOf('undefined') == -1) {
		imgO.src = newSrc;
		}

	}



/*

function rollover_action() {}
function rollover_onload() {}
function rollover_image() {}

*/