function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||value=="")
  {alert(alerttxt);return false}
else {return true}
}
}function validate_form(thisform)
{
with (thisform)
{
 if (validate_required(fullname,"Kontaktní jméno!")==false)
  {fullname.focus();return false}
if (validate_required(company,"Spolecnost!")==false)
  {company.focus();return false}
if (validate_required(email,"E-mailová adresa!")=="")
  {email.focus();return false}  
if (validate_required(telephone,"Telefon!")==false)
  {telephone.focus();return false}


  
}



}