function change(id, valor) {
	document.getElementById(id).value = valor;
}
	
function confirmar(id, valor, msg) {
	if(confirm(msg)) {
		document.getElementById(id).value = valor;
	}
}
function change(id, valor) {
	document.getElementById(id).value = valor;
}
	
function validarCIF(texto){
    
    var pares = 0;
    var impares = 0;
    var suma;
    var ultima;
    var unumero;
    var uletra = new Array("J", "A", "B", "C", "D", "E", "F", "G", "H", "I");
    var xxx;
    
    texto = texto.toUpperCase();
    
    var regular = new RegExp(/^[ABCDEFGHKLMNPQS]\d\d\d\d\d\d\d[0-9,A-J]$/g);
     if (!regular.exec(texto)) return false;
         
     ultima = texto.substr(8,1);

     for (var cont = 1 ; cont < 7 ; cont ++){
         xxx = (2 * parseInt(texto.substr(cont++,1))).toString() + "0";
         impares += parseInt(xxx.substr(0,1)) + parseInt(xxx.substr(1,1));
         pares += parseInt(texto.substr(cont,1));
     }
     xxx = (2 * parseInt(texto.substr(cont,1))).toString() + "0";
     impares += parseInt(xxx.substr(0,1)) + parseInt(xxx.substr(1,1));
     
     suma = (pares + impares).toString();
     unumero = parseInt(suma.substr(suma.length - 1, 1));
     unumero = (10 - unumero).toString();
     if(unumero == 10) unumero = 0;
     
     if ((ultima == unumero) || (ultima == uletra[unumero]))
         return true;
     else
         return false;

}