I use from jqueryvalidation.org the part demo/multipart. All is working fine but at least I don't know how I can include in the validation I used before. In my form before i added a onsubmit function. With the step by step form the validation with onsubmit will be to late. I need to validate in the first step two fileds (KRegSumme and KRate).

how can I include in the multipart demo code like this:

2. function myvalidate()
3. {
5.         var a = document.forms[0].KRegSumme.value;
6.         var b = document.forms[0].KRate.value;
7.         
8.         var r = parseFloat(a);
9.         var m = parseFloat(b);
10.        
11.         if (r > 100*m)
12.         {
13. document.getElementById('error').style.display = 'block';
14. document.getElementById('error').innerHTML = 'La quota mensile deve essere uguale o superiore all 1% del totale dell´importo richiesto!';
16. return false;
17. } 
19. if (m > r/2)
20. {
21. document.getElementById('error').style.display = 'block';
22. document.getElementById('error').innerHTML = 'La quota mensile non potrá essere superiore al 50% dell´importo richiesto!';
24. return false;
25. }
26. }