Maybe it's a bad day for me... I haven't looked at the *.js files, so I have no idea what they validate and I really don't think I want to know.
if your skills are up to it, combine the two validations and call them from one source. Pay attention to anything that is global, eg: i, counter, formname, etc. etc. Make sure that both scripts are not attempting to use same named variables/functions
If your skills are not that good, create a function that calls the 2 in turn and returns a boolean and submit based on that boolean.
and keep your fingers crossed.
if (firstValidation() )
retVal = secondValidation()
else retVal = false;
If all fails, hire someone.