if (document.images)
{	var next = new Image()
	next.src = "next1.gif"
	var next_a = new Image()
	next_a.src = "next2.gif"
    var back = new Image()
    back.src = "back1.gif"
    var back_a = new Image()
    back_a.src = "back2.gif"
}

function inact(imgName)
{   if (document.images)
	document[imgName].src = eval(imgName + '.src')
}

function act(imgName)
{   if (document.images)
	document[imgName].src = eval(imgName + '_a.src')
}