function popColour(colourImage) {
  window.open("/products/images/colours/" + colourImage + ".jpg",'popupWindow','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,copyhistory=no,width=500,height=333,screenX=150,screenY=150,top=150,left=150')
}