Web page with updating data frame

Something that might be of interest for those who might want a web based robot control page. The below code makes a main web page with an iframe page that refreshes with data from the arduino. The rest of the page could contain the bot controls and maybe a video feed. Set the refresh rate to 0 for the fastest update.

// zoomkat's meta refresh data iframe test page 12/24/12
// use in your brouser for main page
// static data page
// meta refresh data page
// for use with W5100 based ethernet shields
// set the refresh rate to 0 for fastest update
// use STOP for single data updates

#include <SPI.h>
#include <Ethernet.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address
byte ip[] = { 192, 168, 1, 102 }; // arduino ip in lan
byte gateway[] = { 192, 168, 1, 1 }; // internet access via router
byte subnet[] = { 255, 255, 255, 0 }; //subnet mask
EthernetServer server(84); //server port
unsigned long int x=0; //set refresh counter to 0
String readString; 


void setup(){
  Ethernet.begin(mac, ip, gateway, gateway, subnet);
  Serial.println("meta refresh data frame test"); // so I can keep track of what is loaded

void loop(){
  EthernetClient client = server.available();
  if (client) {
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
         if (readString.length() < 100) {
          readString += c; 
        //check if HTTP request has ended
        if (c == '\n') {

          //check get atring received

          //output HTML data header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");

          //generate data page
          if(readString.indexOf("data") >0) {  //checks for "data" page
            x=x+1; //page upload counter
            //meta-refresh page every 1 seconds if "datastart" page
            if(readString.indexOf("datastart") >0) client.print("<meta http-equiv='refresh' content='1'>"); 
            client.print("<title>Zoomkat's meta-refresh test</title></head><BODY>
            client.print("page refresh number ");
            client.print(x); //current refresh count

              //output the value of each analog input pin
             for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
             client.print("analog input ");
             client.print(" is ");
          //generate main page with iframe
            client.print("<HTML><HEAD><TITLE>Zoomkat's frame refresh test</TITLE></HEAD>");
            client.print("Zoomkat's Arduino frame meta refresh test 12/24/12");

Arduino analog input data frame:
            client.print("&nbsp;&nbsp;&nbsp;&nbsp;<a href='' target='DataBox' title=''yy''>REFRESH</a>");
            client.print("&nbsp;&nbsp;&nbsp;&nbsp;<a href='' target='DataBox' title=''xx''>STOP</a>
            client.print("<iframe src='' width='35%' height='250' name='DataBox'>");
          //stopping client
          //clearing string for next read