function chk()
 {
  var d=document.frmnewletter;
  if(d.txtNewsletter.value=="")
    {
	 alert("Please enter the email");
	 d.txtNewsletter.focus();
	 return false;
	}
	
	if((d.txtNewsletter.value.indexOf('@')==-1) || (d.txtNewsletter.value.indexOf('.')==-1))
	{
	  alert("Please enter the valid  email");
	 d.txtNewsletter.focus();
	 return false;
	}
	
	
 }