function popup(){
	win_ralf_gellert=window.open("http://tejat.de/~ralfgellert/ralfgellert/intro.php","ralf_gellert","fullscreen=yes,resizble=no,top=0,left=0,border=no");
	win_ralf_gellert.moveTo(0,0);
	win_ralf_gellert.resizeTo(screen.width,screen.height);
	win_ralf_gellert.focus();
}