Im using following script for the image file upload.but its working only chrome,IE supported,but im using infrajestis html5 to my project its not working following code please solve them

<script language="javascript" type="text/javascript">
      debugger
      window.onload = function () {
          var FileUpload1 = document.getElementById("FileUpload1");
          if(FileUpload1 != null)
          {
              FileUpload1.onchange = function () {
                  if (typeof (FileReader) != "undefined") {
                      debugger;
                      var dvPreview = document.getElementById("dvPreview");
                      dvPreview.innerHTML = "";
                      var regex = /^([a-zA-Z0-9\s_\\.\-:])+(.jpg|.jpeg|.gif|.png|.bmp)$/;
                      for (var i = 0; i < FileUpload1.files.length; i++) {
                          var file = FileUpload1.files[i];
                          if (regex.test(file.name.toLowerCase())) {
                              var reader = new FileReader();
                              reader.onload = function (e) {
                                  var img = document.createElement("IMG");
                                  img.height = "100";
                                  img.width = "100";
                                  img.src = e.target.result;
                                  dvPreview.appendChild(img);
                              }
                              reader.readAsDataURL(file);
                          } else {
                              alert(file.name + " is not a valid image file.");
                              dvPreview.innerHTML = "";
                              return false;
                          }
                      }
                  } else {
                      alert("This browser does not support HTML5 FileReader.");
                  }
              }
          };
      }
</script>

<table>
            <tr>
                <td><asp:Label ID="lblcode" runat="server" Text="Employee"></asp:Label></td>
                <td><asp:TextBox ID="txtCode" runat="server" Width="152px"></asp:TextBox><asp:ImageButton ID="ImageButton1" OnClick="ImageButton1_Click" runat="server" ImageAlign="AbsBottom" ImageUrl="~/Images/Select.jpg" Height="21px" Width="32px" /><asp:TextBox ID="txtName" runat="server" Width="135px"></asp:TextBox></td>
                <td></td>
                <td class="auto-style2"></td>
            </tr>
            <tr>
                <td><asp:Label ID="lblDescription" runat="server" Text="Description"></asp:Label></td>
                <td colspan="4"><asp:TextBox ID="txtDescription" runat="server" Width="334px"></asp:TextBox></td>
            </tr>
            <tr>
                <td class="auto-style1"><asp:Label ID="lblpath" runat="server" Text="Path"></asp:Label></td>
                <td colspan="4" class="auto-style1">&nbsp;<input id="FileUpload1" type="file" multiple="multiple" /></td>

            </tr>
            <tr>   <td>    <%-- <hr style="width: 150px" />--%>
        <b>Live Preview</b>
        <br />
        <br />
        <div id="dvPreview">
        </div>
                </td>
                 <td style="text-align:right">
           <asp:Button ID="btnsave" runat="server" CssClass="button" Height="24px"  OnClick="btnsave_Click" Text="Save" ValidationGroup="vchk" Width="65px" />
                       <asp:Button ID="btncancle" runat="server" CssClass="button" Height="24px"
                        Text="Cancel" Width="65px" OnClick="btncancle_Click" />
                </td>

            </tr>
        </table>