var onImages=new Array();
function Rollover(imgName, imgSrc)
{
	onImages[imgName] = new Image();
	onImages[imgName].src = imgSrc;
}

function turnOn(imgName){ 
	if(document.images[imgName].filters != null)
		document.images[imgName].filters[0].apply();
	document.images[imgName].offSrc = document.images[imgName].src;
	document.images[imgName].src    = onImages[imgName].src;
	if(document.images[imgName].filters != null)
		document.images[imgName].filters[0].play();
}

function turnOff(imgName){ 
	if(document.images[imgName].filters != null)
		document.images[imgName].filters[0].stop();
	document.images[imgName].src = document.images[imgName].offSrc;
}

//Specify name of participating images, plus paths to their onMouseover replacements:
Rollover("act1a",  "images/icon_act1aro.jpg");
Rollover("act1b", "images/icon_act1bro.jpg");
Rollover("act2", "images/icon_act2ro.jpg");
Rollover("act3", "images/icon_act3ro.jpg");
Rollover("act4", "images/icon_act4ro.jpg");
Rollover("act5", "images/icon_act5ro.jpg");