// JavaScript Document
function checkChangeSubscription(form)
{
	var fouten = "The following error(s) were found:\n\n";
	var fout = false;
	
	if (form.price.value == "")
	{
	   fout = true;
	   fouten = fouten + "The price is missing\n";
  } else
  if (isNaN(form.price.value))
  {
   fout = true;
   fouten = fouten + "The price is not a numerical value\n";
  }
    
	if (fout)
		alert(fouten);
	else
		form.submit();
}