function imageOn(oImage, imgSrc){ 
	imgName = oImage.name;
	imgOn=eval(imgSrc + "on.src");
	document.all[imgName].src = imgOn; 
	} // end function over_image
	
function imageOff(oImage, imgSrc){ 
	imgName = oImage.name;
	imgOff=eval(imgSrc + "off.src");
	document.all[imgName].src = imgOff; 
	} // end function off_image