function checkEmpty(frm) {
	if(frm.username.value=="" || frm.password.value=="") {
		alert("Please enter username & password.");
		frm.username.focus();
		return false;
	}
	return true;
}

function forward_chk() {
	var for_nam=document.forward_frm.forward_name.value;
	var for_email=document.forward_frm.forward_email.value;
	var ur_nam=document.forward_frm.ur_name.value;
	var ur_email=document.forward_frm.ur_email.value;
	var forward_book=document.forward_frm.forward_book.value;
	var for_comment=document.forward_frm.forward_comments.value;
	var bn=document.forward_frm.bn.value;
	var f1 = document.forward_frm;
	if(for_nam=="") {
		alert("Please enter Name.");
		f1.forward_name.focus();
		return false;
	}	
	else if(for_email=="") {
		alert("Please enter Email.");
		f1.forward_email.focus();
		return false;
	}
	else if(ur_email=="") {
		alert("Please enter Email.");
		f1.ur_email.focus();
		return false;
	}	
	else if(for_comment=="") {
		alert("Please enter Comments.");
		f1.forward_comments.focus();
		return false;
	}
	else {
		invite_friends(for_nam,for_email,for_comment,ur_nam,ur_email,forward_book,bn);
	return false;
	}
}

function invite_friends(for_nam,for_email,for_comment,ur_nam,ur_email,forward_book,bn) {
	http=getHTTPObject();
	var url="/for_books_chk.php?t=forward&name="+for_nam+"&email="+for_email+"&forward_book="+forward_book+"&comments="+for_comment+"&ur_name="+ur_nam+"&ur_emailid="+ur_email+"&bn="+bn;
	url=uncache(url);	
	http.open("GET", url, true);
	http.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
	http.onreadystatechange = function() {
		if(http.readyState==4) {
			var rt=http.responseText;
			var e_div=return_div_span('forward_success');
			if(rt=="t") {
				//e_div.innerHTML="<?=$lang['view_book_book_sent_success']?>";				
				alert("Book Detail forwarded successfully...");
				document.forward_frm.forward_name.value="";
				document.forward_frm.forward_email.value="";
				return false;
			}if(rt=="i") {
				e_div.innerHTML="<font color='red'><?=$lang['view_book_mail_already_sent']?></font>";
				return false;
			} 
			else {
				e_div.innerHTML="<font color='red'><?=$lang['register_server_error']?></font>";
			}
		}
	}
	http.send(null);
}