How to calculate percentage of plagiarized data based on web developed

Hi, I am making a web based software using javascript language and this line of code is for searching based on website query etc. now I want to calculate the percentage of data which is plagiarized....now how can I calculate the percentage....please help me out in this regard,

<script language="Javascript" type="text/javascript">
    //<!
    google.load('search', '1');

    function OnLoad() {
      // Create a search control
      var searchControl = new google.search.SearchControl();

      // Add in a full set of searchers
      var localSearch = new google.search.LocalSearch();
      searchControl.addSearcher(localSearch);
      searchControl.addSearcher(new google.search.WebSearch());
      searchControl.addSearcher(new google.search.VideoSearch());
      searchControl.addSearcher(new google.search.BlogSearch());
      searchControl.addSearcher(new google.search.NewsSearch());
      searchControl.addSearcher(new google.search.ImageSearch());
      searchControl.addSearcher(new google.search.BookSearch());
      searchControl.addSearcher(new google.search.PatentSearch());

      // Set the Local Search center point
      localSearch.setCenterPoint("New York, NY");

      // tell the searcher to draw itself and tell it where to attach
      searchControl.draw(document.getElementById("searchcontrol"));

      // execute an inital search
      searchControl.execute("VW GTI");
    }
    google.setOnLoadCallback(OnLoad);

    //]]>
 
  // Call this function when the page has been loaded
      function initialize() {
        var searchControl = new google.search.SearchControl();
        searchControl.addSearcher(new google.search.WebSearch());
        searchControl.addSearcher(new google.search.NewsSearch());
        searchControl.draw(document.getElementById("searchcontrol"));
      }
      google.setOnLoadCallback(initialize);

// create a search control
var searchControl = new google.search.SearchControl(null);

// add in a full set of searchers
searchControl.addSearcher(new google.search.LocalSearch());
searchControl.addSearcher(new google.search.WebSearch());
searchControl.addSearcher(new google.search.VideoSearch());
searchControl.addSearcher(new google.search.BlogSearch());
searchControl.addSearcher(new google.search.NewsSearch());
searchControl.addSearcher(new google.search.ImageSearch());
searchControl.addSearcher(new google.search.BookSearch());
searchControl.addSearcher(new google.search.PatentSearch());

// tell the searcher to draw itself and tell it where to attach
// Note that an element must exist within the HTML document with id "search_control"
searchControl.draw(document.getElementById("search_control"));
 
 
 
 // create a drawOptions object
var drawOptions = new google.search.DrawOptions();

// tell the searcher to draw itself in linear mode
drawOptions.setDrawMode(google.search.SearchControl.DRAW_MODE_LINEAR);
searchControl.draw(element, drawOptions);

// tell the searcher to draw itself in tabbed mode
drawOptions.setDrawMode(google.search.SearchControl.DRAW_MODE_TABBED);
searchControl.draw(element, drawOptions);

// create a drawOptions object
var drawOptions = new google.search.DrawOptions();
drawOptions.setSearchFormRoot(document.getElementById("searchForm"));

searchControl.draw(element, drawOptions);

var options = new google.search.SearcherOptions();
options.setExpandMode(google.search.SearchControl.EXPAND_MODE_OPEN);
searchControl.addSearcher(new google.search.WebSearch(), options);

// local search, partial
options = new google.search.SearcherOptions();
options.setExpandMode(google.search.SearchControl.EXPAND_MODE_PARTIAL);
searchControl.addSearcher(new google.search.LocalSearch(), options);

// web search, open
options = new google.search.SearcherOptions();
options.setExpandMode(google.search.SearchControl.EXPAND_MODE_OPEN);
searchControl.addSearcher(new google.search.WebSearch(), options);

// web search, open, alternate root
var options = new google.search.SearcherOptions();
options.setExpandMode(google.search.SearchControl.EXPAND_MODE_OPEN);
options.setRoot(document.getElementById("somewhere_else"));
searchControl.addSearcher(new google.search.WebSearch(), options);

// establish a keep callback
searchControl.setOnKeepCallback(this, MyKeepHandler);

function MyKeepHandler(result) {
  // clone the result html node
  var node = result.html.cloneNode(true);

  // attach it
  var savedResults = document.getElementById("saved_results");
  savedResults.appendChild(node);
}

// create a search form without a clear button
// bind form submission to my custom code
var container = document.getElementById("searchFormContainer");
this.searchForm = new google.search.SearchForm(false, container);
this.searchForm.setOnSubmitCallback(this, App.prototype.newSearch);

    </script>

Rabia (Microsoft Student Partner)