function irPagina(pagina) {   
        document.getElementById('numeroPagina').value = pagina;
        document.getElementById('operacion').value = '1000';
        document.getElementById('operacionPaginar').value = '35';
        document.getElementById('forma').submit();
    }

    function cambiaPagina(opPaginar) {                
        document.getElementById('operacion').value = '1000';
        document.getElementById('operacionPaginar').value = opPaginar;
        document.getElementById('forma').submit();
    }

    function ordenar() {                
        document.getElementById('operacion').value = '8';        
        document.getElementById('forma').submit();
    }

    function disabledCombo(objeto, band) {
        document.getElementById(objeto.id).disabled = band;
        if (band)
            document.getElementById(objeto.id).value = "";
    }

    function disabledText(objeto, band) {
        document.getElementById(objeto.id).disabled = band;
        if (band)
            document.getElementById(objeto.id).value = "";
    }

    function disabledButton(objeto, band) {
        document.getElementById(objeto.id).disabled = band;
    }

    function disabledRadio(objeto, band) {     
        for (x = 0; x < objeto.length; x++) {
            document.getElementById(objeto[x].id).disabled = band;
            document.getElementById(objeto[x].id).checked = !band;
        }                
    }

    function getTextFromCombo(combo) {
        index = combo.selectedIndex;
        return combo.options[index].text;
    }