function Rollover(id, off, on){
	this.persist = false;
	this.group = null;
	this.obj = [];
	this.id = [];
	if (typeof id == "string") this.id[0] = id;
	else if (typeof id == "object") for (var i = 0; i < id.length; i++)	this.id[i] = id[i];
	this.oOff = [];
	if (typeof off == "string"){this.oOff[0] = new Image();	this.oOff[0].src = off;}
	else if (typeof off == "object")
	 	for (var i = 0; i < off.length; i++){this.oOff[i] = new Image();this.oOff[i].src = off[i];}
	this.oOn = [];
	if (typeof on == "string"){this.oOn[0] = new Image();this.oOn[0].src = on;}
	else if (typeof on == "object")
		for (var i = 0; i < on.length; i++){this.oOn[i] = new Image();this.oOn[i].src = on[i];}
	if(arguments[3]) this.addToGroup(arguments[3])
}
Rollover.group = [];
Rollover.prototype.addToGroup = function(x){
	if(!Rollover.group[x])Rollover.group[x] = [];
	Rollover.group[x][Rollover.group[x].length] = this
	this.group = Rollover.group[x];
}
Rollover.prototype.on = function(){
	if(!this.obj.length)for (var i = 0; i < this.id.length; i++)this.obj[i] = document.images ? document.images[this.id[i]] : null;
	if(!this.obj[0])return false;
	for (var i = 0; i < this.obj.length; i++)this.obj[i].src = this.oOn[i].src;
}	
Rollover.prototype.off = function(){
	if(this.persist)return;
	if(!this.obj.length)for (var i = 0; i < this.id.length; i++)this.obj[i] = document.images ? document.images[this.id[i]] : null;
	if(!this.obj[0])return false;
	for (var i = 0; i < this.obj.length; i++) this.obj[i].src = this.oOff[i].src;
	if(this.group) for(var i = 0; i < this.group.length; i++) if(this.group[i].persist) this.group[i].on();
}
Rollover.prototype.setPersist = function(){
	this.persist = true;
	this.on();
}