function image_open(file,popis,sirka,vyska) {
if ((sirka>(screen.availWidth-20)) || (vyska>(screen.availHeight-40)))
okno = window.open( "","",'width='+(screen.availWidth/1.5)+',height='+(screen.availHeight/1.5)+',top=100,left=100,location=no,toolbar=no,directories=no,status=no,resizable=yes,scrollbars=yes,copyhistory=no' );
else
okno = window.open( "","",'width='+sirka+',height='+vyska+',top=100,left=100,location=no,toolbar=no,directories=no,status=no,resizable=no,scrollbars=no,copyhistory=no' );
var str_buffer = new String (
"\n"+
"\n"+
" " + popis + " - Kliknutím na obrázek zavřete okno\n"+
"\n"+
"\n"+
"![\"Kliknutím](\"")
\n"+
"\n");
okno.opener = self;
okno.focus();
var okno_doc = okno.document;
okno_doc.write (str_buffer);
okno_doc.close();
}