function opencalculator() {
    window.open('calculatorHK.htm', '_blank', 'width=518,height=410,scrollbars=no');
}

function openmpp() {
    window.open('MPPpopup.htm', '_blank', 'width=490,height=360,scrollbars=yes');
}

function openussq() {
    window.open('USSQpopup.htm', '_blank', 'width=415,height=370,scrollbars=no');
}

function openipo() {
    window.open('IPOpopup.htm', '_blank', 'width=500,height=555,scrollbars=yes');
}