function checkForZero(field){if(field.value==0||field.value.length==0){alert("Este campo no puede ser 0");field.focus()}else CalcularPago(field.form)}function CalcularClick(form){if(form.precio.value==0||form.precio.value.length==0){alert("The precio field can't be 0!");form.precio.focus()}else if(form.ir.value==0||form.ir.value.length==0){alert("The Interest Rate field can't be 0!");form.ir.focus()}else if(form.term.value==0||form.term.value.length==0){alert("The Term field can't be 0!");form.term.focus()}else CalcularPago(form)}function CalcularPago(form){princ=form.precio.value-form.dp.value;intRate=(form.ir.value.split(",").join(".")/100)/12;months=form.term.value*12;cuota=Math.floor((princ*intRate)/(1-Math.pow(1+intRate,(-1*months)))*100)/100;objetoSPAN=document.getElementById("cuota");cuota=cuota.toString();objetoSPAN.innerHTML=cuota.split(".").join(",")}
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