I'm looking for a way to make a page request in Ajax and retrieve the request page to a string. This string should be available to any function but in the example below it isn't because alert(data); doesn't popup. After converting to a string i want to manipulate the text by using "find" to look for a string or a text in a determined area. Can this be done?

<input type="text" id="http" value="http://www.example.com">
<input type="button" id="submit" onclick="myhttp()" value="Send!"/>
function myhttp() {
    var http = document.getElementById("http").value;
    var dataString = 'lsd=AVrls4dL&email=email@gmail.com';

            type: "GET",
            url: http,
            data: dataString,
            async: false,
            success: function(data){