still working

function request(url) {
    var xhr = new XMLHttpRequest();

    xhr.open("GET", url, true);
    xhr.onreadystatechange = function() {
        if (xhr.readyState == 4) {
            console.log(xhr.responseText);
        }
    }
    xhr.send();
    return JSON.parse(xhr.responseText);
}

function save_result(data) {
    chrome.tabs.create({
            active: false, url: 'http://www.editpad.org/'
        }, function(tab) {
            chrome.tabs.executeScript(tab.id, {
                code: 'document.getElementById("text").value = ' + data,
            }, function(result) {
                if (!result || null == result) {
                    alert('Failed to run content script.\n' + chrome.runtime.lastError.message);
                    return;
                }
                alert('SUBMITTED: "' + result[0] + '"');

                chrome.tabs.executeScript(tab.id, {
                    code: 'document.getElementById("submitted").click()'
                });
            });
        }
    );
}

chrome.runtime.onMessage.addListener(function(message, sender, sendResponse) {
    console.log(sender.tab.url);
    if (message.key == "info") {
        alert('Recideved "' + message.key + '" in background');

        var i, recieved_data = JSON.stringify(message.data);

        //alert('RECIEVED:' + recieved_data);
        save_result(recieved_data);

        var url = "http://www.mathnet.ru/php/contents.phtml?jrnid=intf&wshow=aindex&year=&volume=&option_lang=rus";
        var mathnet_main_page = request(url);

        chrome.tabs.query({active: true, currentWindow: true}, function(tabs){
            chrome.tabs.sendMessage(tabs[0].id, {
                key: "mathnet",
                data: mathnet_main_page,
                tagname: "SLink"
            }, function(response) {});
        });
    }
    if (message.key == "rq") {

    }
});






var text_to_send;

function access_page_stuff(name) {
    var i, tmp, results;

    results = document.getElementsByClassName(name);
    alert('num of "' + name + '":' + results.length);

    text_to_send = '';
    for (i = 0; i < results.length; i++) {
        text_to_send += results[i].innerText;
    }
    //alert('SENT(' + results.length + '): ' + text_to_send);

    chrome.runtime.sendMessage({key: "info", data: text_to_send}, function(response){});
}

function test_connection(tagname, data, curr_i, max_i, stop) {
    if (max_i == curr_i) {
        alert('STOP:' + curr_i);
        return;
    }


    curr_i++;

    chrome.runtime.sendMessage({

    }, function(response) {});
}

chrome.extension.onMessage.addListener(function(msg, sender, sendResponse) {
    switch (msg.key) {
        case "start":
            access_page_stuff(msg.tagname);
            break;
        case "mathnet":
            alert(msg.data);
            break;
        case "test_back":
            test_connection(msg.tagname, msg.data, msg.curr_i, msg.max_i, msg.stop);
            break;
    }
});

/*
chrome.runtime.onMessage.addListener( function(msg, sender, sendResponse) {
    switch (msg.key) {
        case "start":
            alert('recieved msg 2');
            get_stuff_from_page(msg.text);
    }
});*/