Hi! I´m a newbie spanish programmer and i trying to do an calculator banner in javascript with ajax.. but i can´t do it works.. Well, the objective is make an aplication banner is like this : http://www.fundaciontripartita.es/publico/FormularioCalculoCredito2007.aspx but the calculator must be show a varying in the label, without push the button "calcular" .. This is the code: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <title> Calculadora Ajax </title> <script src="jquery-1.2.3.min.js" type="text/javascript"> </script> <script type="text/javascript"> function validar(formu) { numemp = parseInt(formu.numeroEmpleados.value, 10); //convierte en valores enteros los datos del formulario (base 10) tc1 = parseInt(formu.TC1.value, 10); cf = parseInt(formu.CF.value, 10); if ( isNaN(numemp) && isNaN(tc1) ) { //valida que sean numeros alert("Debe cumplimentar los dos campos con valores numericos."); return false; } if ( numemp < 0 || tc1 < 0 ) { //valida que sean positivos alert("Los valores numericos introducidos deben ser positivos."); return false; //ok, envio formulario } if (numemp >= 6 && numemp <=9 ) { cf = tc1 * 0.007; alert("Credito formativo = " + cf); return true; } if (numemp > 10 && numemp < 49 ) { cf = tc1 * 0.007 * 0.075; alert("Credito formativo = " + cf); return true; } if (numemp > 50 && numemp < 249 ) { cf = tc1 * 0.007 * 0.060; alert("Credito formativo = " + cf); return true; } if (numemp > 250 ) { cf = tc1 * 0.007 * 0.050; alert("Credito formativo = " + cf); return true; } } </script> </head> <body> <form name="miFormu" onSubmit="return validar(this);"> <p> <input name="numeroEmpleados" type="text" size="10"> Numero empleados<br> <input name="TC1" type="text" size="10"> TC1<br> <input type="submit" name="miSubmit" value="Consultar"> </p> </form> </body> </html> I think the function code is right but im not sure..whats wrong? perhaps the html code?.. i need your help urgently!! Thanks!