x0=(screen.width-868)/2;
y0=(screen.height-650)/2;

function openNavigation() {
  winnav=window.open('navigation.htm','nav','width=356,height=312');
  winnav.moveTo(x0,y0);
}

function showArticle(mag,text) {
	winrev=window.open(mag,'rev','width=356,height=300');
	winrev.moveTo(x0,y0+357);
	wintext=window.open(text,'txt','width=512,height=656');
	wintext.moveTo(x0+374,y0);
}