function popup(whereto) { 
    
    var logWindow;

    var toppy;

    var lefty;

    toppy = (screen.height-340)/2;

    lefty = (screen.width-370)/2;
 
    logWindow =window.open('','EmailWindow','width=370,height=340,top='+toppy+', left='+lefty);     logWindow.document.open();
    
    logWindow.document.location.href=whereto;
        logWindow.document.close();
    logWindow.document.focus();
    
}