// sing up newsletter form  checked
function isSubmitedNewsletterForm(){
  	var form0 = document.formNewsletter;
	 var first_name = form0.first_name.value + "";
	 var email_address = form0.email_address.value + "";
	 if(first_name.length <1 && email_address.length  > 0){
	  alert("Please fill in your name.");
	  return false ;
	 }else if(email_address.length < 1 && first_name.length > 0){
	  alert("Please fill in your email.");
	  return false ;
	 }else if (first_name.length <1 && email_address.length < 1){
	   alert("Please complete the form.");
	   return false ;
	 }else{
	  if(email_address.indexOf("@") >0 ){		  
		window.open('http://www2.echineselearning.com/bottom/sendEbookInSignUpNewslleter.do?first_name='+first_name + '&email_address='+email_address,'_blank');
	  }else{
	   alert("Please fill in a valid email address.");
	   return false ;
	  }
	 }

}