function launch(amount){
winOptions = 'location=no,toolbar=no,menubar=no,status=no,directories=no,resizeable=yes,scrollbars=yes,height=300,width=500'
if (navigator.appName == 'Netscape') winOptions += ',innerHeight=290,innerWidth=490,screenX=10,screenY=10'
else winOptions += ',left=10,top=10'
window.open('http://www.postpressed.com.au/convert.html?' +amount, 'convert', winOptions) 
};