function openWin1() {
  popupWin = window.open('image1.htm', 'info', 'scrollbars=no,width=430,height=430')
}

function openWin2() {
  popupWin = window.open('image2.htm', 'info', 'scrollbars=no,width=430,height=430')
}

function openWin3() {
  popupWin = window.open('image3.htm', 'info', 'scrollbars=no,width=430,height=430')
}

function openWin4() {
  popupWin = window.open('image4.htm', 'info', 'scrollbars=no,width=430,height=430')
}