function openWindowCentered(){
window.open(href="qtobject_simple.html", 'newwin', 'width=500, height=350, left='+(screen.width-700)/2+', top='+(screen.height-350)/2+', resizable=no, scrollbars=no, toolbars=no, location=no, directories=no, status=no, menubar=no, copyhistory=no');
}