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(name,"Name must be filled out!")==false)
  {name.focus();return false;}
  
  if (validate_required(phone,"Phone number must be filled out!")==false)
  {phone.focus();return false;}
  
  if (validate_required(email,"Email must be filled out!")==false)
  {email.focus();return false;}
  
  if (validate_required(address,"Address must be filled out!")==false)
  {address.focus();return false;}
  }
}