How Do I Check Whether An Url Consists Of Http://

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Javascript

In dealing a requirement of Search Engine Optimization based module i drag my self in a requirement of verifying whether user enters URL with prefix of Http:// or not...if he enters it's all ok...but if he not prefix his URL with Http:// my code must add that as prefix to entered URL by user.....and also i need to check whether URL contains WWW(with prefix)...if not my code must add this WWW to entered URL by user....I had done a really hard work on this but i can't fix it....it will be more broad welcome from my side for any advice's or suggestions towards achieving my requirement ...using java script...:)
here is my controller code to verify the sitemap and robots of the provided url

public string GetAllSemData(string givenurl)
        {
            var retval = string.Empty;
            Seoproperties obj = new Seoproperties();
            StringBuilder sb = new StringBuilder();
            Dictionary<string, string> results = new Dictionary<string, string>();
            #region Sitemap.xml and robots.txt

            string[] names = new string[2] { "/sitemap.xml", "/robots.txt" };
            sb.AppendLine("<table id='tblLists' class='gridtable' width='100%'>");
            sb.AppendLine("<thead><tr>");
            sb.AppendLine("<th>SEO </th>");
            sb.AppendLine("<th>RESULTS</th>");
            sb.AppendLine("</tr></thead>");
            sb.AppendLine("<tbody>");
            foreach (var item in names)
            {
               // string addHttp = "http://";
               try
                {
                    WebRequest request = HttpWebRequest.Create("" + givenurl + "" + item + "");
                        //HttpWebRequest.Create("http://" + givenurl + "" + item + "");
                    request.Method = "HEAD"; // Just get the document headers, not the data.
                    request.Credentials = System.Net.CredentialCache.DefaultCredentials;
                    using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
                    {
                        if (response.StatusCode == HttpStatusCode.OK)
                        {
                            retval = (item + " exists!");
                            if (retval == "/sitemap.xml exists!")
                            {
                                //results.Add("XML Sitemap", "Great,you site has an XML Sitemap");
                                sb.AppendLine("<tr>");
                                sb.AppendLine("<td><img src='images/1382554024_ok-green.png' alt='ok' />XML Sitemap</td>");
                                sb.AppendLine("<td>Great,you site has an XML Sitemap</td>");
                                sb.AppendLine("</tr>");
                            }
                            else
                            {
                                sb.AppendLine("<tr>");
                                sb.AppendLine("<td><img src='images/1382554024_ok-green.png' alt='ok' />robots.txt</td>");
                                sb.AppendLine("<td>Great,your site has an robots.txt file</td>");
                                sb.AppendLine("</tr>");
                                // results.Add("robots.txt", "Great,your site has an robots.txt file");
                            }
                        }
                        else
                        {
                            // Some other HTTP response - probably not good.min
                            // Check its StatusCode and handle it.
                        }
                    }
                }
                catch (WebException ex)
                {
                    //HttpWebResponse webResponse = new HttpWebResponse();

                    HttpWebResponse webResponse = (HttpWebResponse)ex.Response;
                    // Determine the cause of the exception, was it 404?
                    if (webResponse.StatusCode == HttpStatusCode.NotFound)
                    {
                        MessageBox.Show(webResponse.StatusDescription);
                        retval = (item + "   does'nt exists!");
                        if (retval == "/sitemap.xml   does'nt exists!")
                        {
                            sb.AppendLine("<tr>");
                            sb.AppendLine("<td><img src='images/cross_circle.png' />XML Sitemap</td>");
                            sb.AppendLine("<td>Your Website does not have an XML Sitemap kindly create it.</td>");
                            sb.AppendLine("</tr>");
                            //results.Add("XML Sitemap", "Your Website does not have an XML Sitemap kindly create it.");
                        }
                        else
                        {
                            sb.AppendLine("<tr>");
                            sb.AppendLine("<td><img src='images/cross_circle.png' />robots.txt</td>");
                            sb.AppendLine("<td>Your Website does not have Robots.txt file kindly create it.</td>");
                            sb.AppendLine("</tr>");
                            //results.Add("robots.txt", "Your Website does not have Robots.txt file kindly create it.");
                        }
                    }
                    else
                    {
                        // Handle differently...
                        retval = (ex.Message);
                    }
                }
            }

here is my JavaScript code to verify the url

function SubmitUrl() {

       var addHttp = 'http://';
       //if (!givenurl.match(/^[]a-zA-z]+:\/\//)) {
       //    givenurl = 'http://' + givenurl;

       //}



       var givenurl = addHttp+$("#txtUrl").val();

       $.ajax({
           url: "Analysis/Checkfilesexitsornot?givenurl=" + givenurl,
           type: 'POST',
           cache: false,
           data: '',
           success: Checkingfilesexits,
           failure: function myfunction(response) {
               alert(response.d);
           }
       });

       return false;
   }

in my JavaScript code i had taken a variable and added http:// to the given URL variable but i need to check both Http:// & WWW.. to check and add to the given Url...the o?p of this code will be displaying information about given URL website (title,content,robots,XML Sitemap,description of the web page of given URL in a table)he i had taken table in sb(string builder)and adding the columns of Seo,Results....2ND table is MetaData,Results of the website of given Url...