function checkform(form)
{
	var str=" ";
	if(!form.author.value) 
	{
		str="Name is required\n";
		alert(str);
		return false;	
	}
	else if(!form.email.value)
	{
		str+="Email is required\n";
		alert(str);
		return false;
	}
	else if(!valid(form.email.value))
	{
  		str+="Email not valid\n";
		alert(str);
		return false;
	}
	else if(!form.comment.value)
	{
		str+="Please type a comment";
		alert(str);
		return false;
	}
  else {
	  return true;
	  }
}


function valid($value)
{
	apos=$value.indexOf("@");
  	dotpos=$value.lastIndexOf(".");
  		if (apos<1||dotpos-apos<2)
    	{
			return false;
		}
  		else
			return true;
}