How do add image button to tittle bar of dialog box using jquery(mvc 4)?

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ASP.NET

jQuery

MVC4

<button type="submit" id="btn" name="Command" value="Cancel" onclick="location.href='<%: Url.Action("Capture", "TTSCreate") %>'" />

<script>
    $("[id*=btn]").click(function (e) {
        alert('This is a custom alert box', 'Alert Dialog');

    });
</script>

[HttpPost]
public ActionResult Capture(PrtScreen prt, string command)
{

if (command == "Cancel")
{
int FileCount = 0;

//int screenWidth = Screen.GetBounds(new Point(0, 0)).Width;
//int screenHeight = Screen.GetBounds(new Point(0, 0)).Height;
Bitmap bmpScreenShot = new Bitmap(1920, 1080);
Graphics gfx = Graphics.FromImage((Image)bmpScreenShot);
gfx.CopyFromScreen(0, 0, 0, 0, new Size(1920, 1080));
bmpScreenShot.Save("d:\\example" + FileCount + ".jpg ", ImageFormat.Png);

}