function validateForm(){
 form = document.myForm;
 fname = form.idp.value;
 if(fname.length<3) {
  alert('Vložte minimálne 3 symboly - (Zeman = Zem, ema, man ...).');
  return false;
 }
 
sdiak="áäčďéěíĺľňóôőöŕšťúůűüýřžÁÄČĎÉĚÍĹĽŇÓÔŐÖŔŠŤÚŮŰÜÝŘŽ";
bdiak="aacdeeillnoooorstuuuuyrzAACDEEILLNOOOORSTUUUUYRZ"; 
 {
form = document.myForm;
tx=""; txt=form.idp.value;
for(p=0;p<txt.length;p++)
{
if (sdiak.indexOf(txt.charAt(p))!=-1)
tx+=bdiak.charAt(sdiak.indexOf(txt.charAt(p)));
else tx+=txt.charAt(p);
}
form.idp.value=tx;
}

 return true;
}