function na_open_window(url, name, left, top, width, height, toolbar, menubar, statusbar, scrollbar, resizable)
{

var w;
w = window.open(url, name, 'left='+left+',top='+top+',width='+width+',height='+height+',toolbar='+toolbar+',menubar='+menubar+',status='+statusbar+',scrollbars='+scrollbar+',resizable='+resizable);

w.window.focus();
wx = width;
wy = height;
x = (screen.width - wx ) / 2;
y = (screen.height - wy ) / 7;
w.window.moveTo(x,y);
}