function cieloblu() {
   finestra=window.open('http://www.cieloblu.it/','cieloblu','scrollbars=yes, resizable=yes, top=16%0,left=50, width=900,height=480');
   }

function cartoline() {
   finestra=window.open('http://hirise.lpl.arizona.edu/','cartoline','scrollbars=yes, resizable=yes, top=16%0,left=50, width=900,height=480');
   }
function cielomese() {
   finestra=window.open('http://www.astronomia.com/category/articoli/cielo-mese','cielomese','scrollbars=yes, resizable=yes, top=16%0,left=50, width=900,height=480');
   }
function internazionale() {
   finestra=window.open('http://www.astronomy2009.it/','internazionale','scrollbars=yes, resizable=yes, top=16%0,left=50, width=900,height=480');
   }
function classgalassie() {
   finestra=window.open('http://www.galaxyzoo.org','classgalassie','scrollbars=yes, resizable=yes, top=16%0,left=50, width=900,height=480');
   }
function cielostellato() {
   finestra=window.open('http://www.stellarium.org/it/','cielostellato','scrollbars=yes, resizable=yes, top=16%0,left=50, width=900,height=480');
   }
   function HST() {
   finestra=window.open('http://hubblesite.org/gallery/','HST','scrollbars=yes, resizable=yes, top=16%0,left=50, width=900,height=480');
   }
function spitzer() {
   finestra=window.open('http://gallery.spitzer.caltech.edu/Imagegallery/chron.php?cat=Astronomical_Images','Spitzer','scrollbars=yes, resizable=yes, top=16%0,left=50, width=900,height=480');
   }
function OsservatorioSolare() {
   finestra=window.open('http://umbra.nascom.nasa.gov/images/','SOHO','scrollbars=yes, resizable=yes, top=16%0,left=50, width=900,height=480');
   }