function showPopup(showpage) {
wx = 700;
wy = 650;
x = (screen.width - wx) / 2;
y = (screen.height - wy) / 2;
subWin = window.open(showpage,'','width='+wx+',height='+wy+',scrollbars=yes,resizable=yes,left='+x+',top='+y);
}