Volver a la pagina despues de validar campos

[urgido]

function comprobar(form){
if((form.caja1.value=="")||(form.caja7.value=="")| |(form.caja8.value=="")||(form.caja9.value=="")||
(form.caja5.value=="0")||(form.caja6.value=="0")){
alert("Debes rellenar los campos obligatorios!");
}
} else{
alert("Todos los datos correctos");
return false;
}