function is_empty(value)
{
  var counter = 0;
  for(var i=0;i<value.length;i++)
  if (value[i]==" ") counter++;
  if (counter == value.length) return true;
  else return false;
}

function isDigit(value)
{
	i=-1;
	//parseInt(strval)
	flag = 0;
	
	
	while(++i<value.length)
	{
		//alert(value.charAt(i)+"  "+i);
		if (parseInt(value.charAt(i))>0 || parseInt(value.charAt(i))<9 || value.charAt(i) == "." || value.charAt(i) == ",") continue;
		else {flag=1;break;}
		
	}
	
	
	if (flag == 0)
		return true;
	else
		return false;
}





function mail_form_check()
{
	var value;
	var ff = document.mail_form;
	var msg = "";
	if (is_empty(ff.email.value))
		msg += "Email field is empty\n";
	if (is_empty(ff.subject.value))
		msg += "Subject field is empty\n";
	if (is_empty(ff.message.value))
		msg += "Message field is empty\n";
	if (msg != "")
	{
		alert("Errors: \n\n"+msg);
		return false
	}
	else return true;
}