Te paso una que funciona en IE 6 y NS 6.2 y 7 (al menos). Un saludo.
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var marqueecontent='<table border=0 cellpadding=0 cellspacing=0 width=310><tr><td width=10 valign=top><a href=\'#\' onClick="javascript:window.open(\'pagina.htm\',\'d etalle\',\'width=720,height=400,left=30,top=100,sc rollbars=1\');"><img src=transparente.gif width=10 height=7 border=0 vspace=3></a></td><td width=300 valign=top><a href=\'#\' onClick="javascript:window.open(\'pagina.htm\',\'d etalle\',\'width=720,height=400,left=30,top=100,sc rollbars=1\');" style=\'text-decoration:none\'><font face=verdana size=1 color=4c4c4c><b><font color=990000>Argentina </font>Oyentes exigen la restitución de una frecuencia radial de la Ciudad de Buenos Aires</b><br><i>Andrés C. D´Alessandro, Buenos Aires</i></font></a><br></td></tr><tr><td height=16 valign=top><img src=transparente.gif></td></tr><tr><td width=10 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=27\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');"><img src=transparente.gif width=10 height=7 border=0 vspace=3></a></td><td width=300 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=27\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');" style=\'text-decoration:none\'><font face=verdana size=1 color=4c4c4c><b><font color=990000>Bolivia </font>Fiscal llama a declarar a camarógrafos por "supuesta complicidad en un delito"</b><br><i>Oscar Ordóñez, La Paz</i></font></a><br></td></tr><tr><td height=16 valign=top><img src=transparente.gif></td></tr><tr><td width=10 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=23\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');"><img src=transparente.gif width=10 height=7 border=0 vspace=3></a></td><td width=300 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=23\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');" style=\'text-decoration:none\'><font face=verdana size=1 color=4c4c4c><b><font color=990000>Bolivia </font>La Red televisiva ATB sufre un atentado de bala</b><br><i>Oscar Ordóñez, La Paz</i></font></a><br></td></tr><tr><td height=16 valign=top><img src=transparente.gif></td></tr><tr><td width=10 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=24\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');"><img src=transparente.gif width=10 height=7 border=0 vspace=3></a></td><td width=300 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=24\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');" style=\'text-decoration:none\'><font face=verdana size=1 color=4c4c4c><b><font color=990000>Chile </font>Colegio de Periodistas recurre a Consejo Nacional de Televisión</b><br><i>Claudia Lagos Lira, Santiago de Chile</i></font></a><br></td></tr><tr><td height=16 valign=top><img src=transparente.gif></td></tr><tr><td width=10 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=30\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');"><img src=transparente.gif width=10 height=7 border=0 vspace=3></a></td><td width=300 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=30\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');" style=\'text-decoration:none\'><font face=verdana size=1 color=4c4c4c><b><font color=990000>Chile </font>Torres: El Estado no tiene política para promover la comunicación social</b><br><i>Claudia Lagos Lira, Santiago de Chile</i></font></a><br></td></tr><tr><td height=16 valign=top><img src=transparente.gif></td></tr><tr><td width=10 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=25\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');"><img src=transparente.gif width=10 height=7 border=0 vspace=3></a></td><td width=300 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=25\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');" style=\'text-decoration:none\'><font face=verdana size=1 color=4c4c4c><b><font color=990000>Chile </font>Tribunal impide emisión de programa televisivo</b><br><i>Claudia Lagos Lira, Santiago de Chile</i></font></a><br></td></tr><tr><td height=16 valign=top><img src=transparente.gif></td></tr><tr><td width=10 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=22\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');"><img src=transparente.gif width=10 height=7 border=0 vspace=3></a></td><td width=300 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=22\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');" style=\'text-decoration:none\'><font face=verdana size=1 color=4c4c4c><b><font color=990000>Colombia </font>A juicio columnista acusado por injuria y calumnia</b><br><i>Carlos Eduardo Huertas, Bogotá</i></font></a><br></td></tr><tr><td height=16 valign=top><img src=transparente.gif></td></tr><tr><td width=10 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=28\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');"><img src=transparente.gif width=10 height=7 border=0 vspace=3></a></td><td width=300 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=28\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');" style=\'text-decoration:none\'><font face=verdana size=1 color=4c4c4c><b><font color=990000>Ecuador </font>Nuevas críticas del Presidente contra articulistas y comentaristas</b><br><i>Miguel Rivadeneira, Quito</i></font></a><br></td></tr><tr><td height=16 valign=top><img src=transparente.gif></td></tr><tr><td width=10 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=26\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');"><img src=transparente.gif width=10 height=7 border=0 vspace=3></a></td><td width=300 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=26\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');" style=\'text-decoration:none\'><font face=verdana size=1 color=4c4c4c><b><font color=990000>Perú </font>Monseñor Luis Bambarén exhortó a jóvenes periodistas a ser portadores de la verdad</b><br><i>Augusto Riera Rodriguez, Chimbote</i></font></a><br></td></tr><tr><td height=16 valign=top><img src=transparente.gif></td></tr><tr><td width=10 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=29\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');"><img src=transparente.gif width=10 height=7 border=0 vspace=3></a></td><td width=300 valign=top><a href=\'#\' onClick="javascript:window.open(\'detalle.php?idio ma=C&id=29\',\'detalle\',\'width=720,height=400,le ft=30,top=100,scrollbars=1\');" style=\'text-decoration:none\'><font face=verdana size=1 color=4c4c4c><b><font color=990000>Venezuela </font>Cobran fuerza leyes de desacato en Venezuela</b><br><i>Glexy Dugarte, Barquisimeto</i></font></a><br></td></tr><tr><td height=16 valign=top><img src=transparente.gif></td></tr></table>'
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