How can one stop url rewriting in kentico 2.0

For example the following is called in img tag of a web page.

public string ThumbUrl(string imageID,int width,int height,string resize)
{
url = "TrisetImage.aspx?id=" + imageID + "&rev=1&width=" + Convert.ToString(width) + "&height=" + Convert.ToString(height) +"&resize=" + resize;
}

Due to url rewriting i think its not displaying image. any suggestions.