eccolo mi fa la somma automatica...come faccio soo a dirgli che se la somma č diversa da 10 me lo segnali come errore?
<script type="text/javascript" language="JavaScript">
<!--
function dp(price)
{
string = "" + price;
number = string.length - string.indexOf('.');
if (string.indexOf('') == -1)
return string + '';
if (number == 1)
return string + '';
if (number == 2)
return string + '';
if (number > 3)
return string.substring(string.length-number+3);
return string;
}

function calculate()
{
document.calcform.total1.value = dp(eval(document.calcform.c1.value)+eval (document.calcform.b1.value)+eval(document.calcfor m.a1.value))
document.calcform.total2.value = dp(eval(document.calcform.c2.value)+eval (document.calcform.b2.value)+eval(document.calcfor m.a2.value))
document.calcform.total3.value = dp(eval(document.calcform.c3.value)+eval (document.calcform.b3.value)+eval(document.calcfor m.a3.value))
document.calcform.total4.value = dp(eval(document.calcform.c4.value)+eval (document.calcform.b4.value)+eval(document.calcfor m.a4.value))
document.calcform.total5.value = dp(eval(document.calcform.c5.value)+eval (document.calcform.b5.value)+eval(document.calcfor m.a5.value))
document.calcform.total6.value = dp(eval(document.calcform.c6.value)+eval (document.calcform.b6.value)+eval(document.calcfor m.a6.value))
document.calcform.total7.value = dp(eval(document.calcform.c7.value)+eval (document.calcform.b7.value)+eval(document.calcfor m.a7.value))
document.calcform.total8.value = dp(eval(document.calcform.c8.value)+eval (document.calcform.b8.value)+eval(document.calcfor m.a8.value))
document.calcform.total9.value = dp(eval(document.calcform.c9.value)+eval (document.calcform.b9.value)+eval(document.calcfor m.a9.value))
document.calcform.total10.value = dp(eval(document.calcform.c10.value)+eval (document.calcform.b10.value)+eval(document.calcfo rm.a10.value))
document.calcform.total11.value = dp(eval(document.calcform.c11.value)+eval (document.calcform.b11.value)+eval(document.calcfo rm.a10.value))
document.calcform.total12.value = dp(eval(document.calcform.c12.value)+eval (document.calcform.b10.value)+eval(document.calcfo rm.a12.value))
document.calcform.total13.value = dp(eval(document.calcform.c13.value)+eval (document.calcform.b10.value)+eval(document.calcfo rm.a13.value))
document.calcform.total14.value = dp(eval(document.calcform.c14.value)+eval (document.calcform.b14.value)+eval(document.calcfo rm.a14.value))
document.calcform.total15.value = dp(eval(document.calcform.c15.value)+eval (document.calcform.b15.value)+eval(document.calcfo rm.a15.value))
document.calcform.total16.value = dp(eval(document.calcform.c16.value)+eval (document.calcform.b16.value)+eval(document.calcfo rm.a16.value))
document.calcform.total17.value = dp(eval(document.calcform.c17.value)+eval (document.calcform.b17.value)+eval(document.calcfo rm.a17.value))

}

//-->
</script>