sacusate ho risolto con :
if((data == "DataAss")&&(ora=="OraAss")){
this.frmHelpdesk.DataAss.value = gg+mm+aaaa;
this.frmHelpdesk.OraAss.value = hh+i;
}
if((data == "DataSoll")&&(ora=="OraSoll")){
this.frmHelpdesk.DataSoll.value = gg+mm+aaaa;
this.frmHelpdesk.OraSoll.value = hh+i;
}