function changeImagePrint(button)
{
document.images[button].src= "images/printb.gif";
return true;
}
function changeImageBackPrint(button) 
{
document.images[button].src= "images/printa.gif";
 return true;
}

function changeImageBack(button)
{
document.images[button].src= "images/go_backb.gif";
return true;
}
function changeImageBackBack(button) 
{
document.images[button].src= "images/go_backa.gif";
 return true;
}

function changeImageStartAgain(button)
{
document.images[button].src= "images/start_againb.gif";
return true;
}
function changeImageBackStartAgain(button) 
{
document.images[button].src= "images/start_againa.gif";
 return true;
}

function changeImageCalculate(button)
{
document.images[button].src= "images/calculateb.gif";
return true;
}
function changeImageBackCalculate(button) 
{
document.images[button].src= "images/calculatea.gif";
 return true;
}

function changeImageEnquireNow(button)
{
document.images[button].src= "images/enquire_nowb.gif";
return true;
}
function changeImageBackEnquireNow(button) 
{
document.images[button].src= "images/enquire_nowa.gif";
 return true;
}

<!-- Copyright 2001 William Bontrager
var Type = 'Z';
function StartFloat() {
window.moveTo(0,0);
window.resizeTo(screen.width,screen.height);
if(document.all) {
	document.all.AdFloater.style.pixelLeft = document.body.clientWidth - document.all.AdFloater.offsetWidth;
	document.all.AdFloater.style.visibility = 'visible';
	Type = 'A';
	}
else if(document.layers) {
	document.AdFloater.left = window.innerWidth - document.AdFloater.clip.width - 16;
	document.AdFloater.visibility = 'show';
	Type = 'B';
	}
else if(document.getElementById) {
	document.getElementById('AdFloater').style.left = (window.innerWidth - 35) + 'px';
	document.getElementById('AdFloater').style.visibility = 'visible';
	Type = 'C';
	}
if (document.all) { window.onscroll = Float; }
else { setInterval('Float()', 100); }
}
function Float() {
if (Type == 'A') { document.all.AdFloater.style.pixelTop = document.body.scrollTop; }
else if (Type == 'B') { document.AdFloater.top = window.pageYOffset; }
else if (Type == 'C') { document.getElementById('AdFloater').style.top = window.pageYOffset + 'px'; }
}