// Standard mouseover
if (document.images) {
  prefectureOff = new Image(); prefectureOff.src="http://maps.inc.free.fr/images/prefecture.gif";
  prefectureOn = new Image(); prefectureOn.src="http://maps.inc.free.fr/images/prefectureGrey.gif";
  bigCityOff = new Image(); bigCityOff.src="http://maps.inc.free.fr/images/bigCity.gif";
  bigCityOn = new Image(); bigCityOn.src="http://maps.inc.free.fr/images/bigCityGrey.gif";
  mediumCityOff = new Image(); mediumCityOff.src="http://maps.inc.free.fr/images/mediumCity.gif";
  mediumCityOn = new Image(); mediumCityOn.src="http://maps.inc.free.fr/images/mediumCityGrey.gif";
  smallCityOff = new Image(); smallCityOff.src="http://maps.inc.free.fr/images/smallCity.gif";
  smallCityOn = new Image(); smallCityOn.src="http://maps.inc.free.fr/images/smallCityGrey.gif";
}

function img_act(img, imgName) {
	if (document.images) {
		document[imgName].src = eval(img + "On.src");
	}
}

function img_inact(img, imgName) {
	if (document.images) {
		document[imgName].src = eval(img + "Off.src");
	}
}

function img_over(imgSrc, imgName) {
	if (document.images) {
		document[imgName].src = imgSrc;
	}
}

function img_out(imgSrc, imgName) {
	if (document.images) {
		document[imgName].src = imgSrc;
	}
}