Used this code to do what I wanted... But it places the script/ google preview button (in my case) to either header or the footer . But no other way to do this.
         HtmlGenericControl script1 = new HtmlGenericControl("script");
        script1.Attributes.Add("type", "text/javascript");
        script1.Attributes.Add("src", "http://books.google.com/books/previewlib.js");
        this.Page.Header.Controls.Add(script1);
        string GoogleScript = "";
        string isbncode = "";
        if (Page.Request.QueryString["isbn"] != null)
            isbncode = Page.Request.QueryString["isbn"];
        GoogleScript = "GBS_setLanguage('en'); GBS_insertPreviewButtonPopup('ISBN:";
        isbncode = isbncode + "');";
        HtmlGenericControl script3 = new HtmlGenericControl("script");
        script3.Attributes.Add("type", "text/javascript");
        script3.InnerHtml = GoogleScript + isbncode ;
        this.Page.Controls.Add(script3);