Código HTML:
<html> <head> <script type='text/javascript'> var checkboxes = document.getElementById("tabla2").home; for (var x=0; x < checkboxes.length; x++){ if (checkboxes[x].checked){ }else{ alert("Seleccione al menos 1 registro.."); break; } } </script> </head> <body> <form name="tabla2" method="POST"> <input type='checkbox' name='home' value='1'> <input type='button' value='Aceptar' onclick='cargar();'> </form> </body> </html>