function abrir_creditos(url_,ancho_,alto_,scroll){
	url_final='/web/creditos/'+url_+'.asp';
	window.open(url_final,url_,'width='+ancho_+',height='+alto_+', scrollbars='+scroll);
}

function cambia_check(checkbox){
	eval('document.form1.'+checkbox+'.checked=!document.form1.'+checkbox+'.checked;')
}