var Directory = "images/";
var OnImg= "Button_Over.png";
var OffImg= "Button_Off.png";

function ChangeImg(Image, Action)
{ 
	if (Action == "On") 
		document.images[Image].src = Directory + OnImg;
	else 
		document.images[Image].src = Directory + OffImg;
};
   
function PreLoadImages()
{ 
	LoadList= new Array("Button_Over.png", "Button_Off.png");
	OnImages= new Array();
	for (field in LoadList) 
	{
		OnImages[field]= new Image();
		OnImages[field].src= Directory + LoadList[field];
	}
};