There's a frame (frizq-admin_imgs.jsp) that works alone (as a page), but I can't make it work = as a frame. It produces a ServletException, I don't know why. The frame-parent-pages are these: <html> <head> <title>Administración de imágenes --- Generación Dinámica de Webs</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> </head> <frameset rows="120,*" frameborder="NO" border="0" framespacing="0"> <frame name="frsup" src="frsup-admin_imgs.jsp" scrolling="NO"> <frame name="bottomFrame" scrolling="NO" noresize src="frinf-admin_imgs.jsp"> </frameset> <noframes> <body bgcolor="#FFFFFF" text="#000000"> </body> </noframes> </html> frinf-admin_imgs.jsp: <html> <head> <title>Administración de imágenes --- Generación Dinámica de Webs</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> </head> <frameset cols="320,*" frameborder="NO" border="0" framespacing="0"> <frame name="frizq" src="frizq-admin_imgs.jsp" marginwidth="0" marginheight="0" scrolling="NO"> <frame name="frder" scrolling="NO" noresize src="frder-admin_imgs.jsp" marginwidth="0" marginheight="0"> </frameset> <noframes> <body bgcolor="#FFFFFF" text="#000000"> </body> </noframes> </html> Must I put any struts-tag on them, or something so? Any idea? Any similar example? Thank-you everybody!