n = (document.layers)? 1:0; // netscape
ie = (document.all)? 1:0;   // internet explorer
if(n) 
        {
                var window_width = (screen.width - 5 );
                var window_height = (screen.height - 23 );
        }
if (ie) 
        {
                var window_width = ( screen.width - 10 );
                var window_height = ( screen.height - 55) ;
                var window_left = 0;
                var window_top = 0;
        }

function maximize(pagina)
{ 
        var mywin=window.open(pagina, '', 'width='+window_width+', height='+window_height+', toolbar=no, status=yes, menubar=no, scrollbars=no, fullscreen=yes, dependent=0,directories=0,channelmode=1,location=0,copyhistory=0')
mywin.moveTo(+window_left, +window_top)
}