Código javascript:
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var yearV = new Array("2056","2052","2048","2044","2040","2036","2032","2028","2024","2020","2016","2012","2008","2004","2000","1996","1992","1988","1984","1980","1976","1972","1968","1964","1960","1956","1952","1948","1944","1940","136","1932","1928","1924","1920","1916","1912","1908","1904","1900"); function cambia_dia(){ var mes mes = document.form.mes[document.form.mes.selectedIndex].value year = document.form.year[document.form.year.selectedIndex].value if (year == valueOf.yearV){ numero_2 = viciesto; } }