如何给WEBPART中增加客户端代码

应该注意一点就是在客户端代码中，要使用控件名称的时候，就应该在
cboSite.Atributes.add("ID","cboSite");

        HtmlInputButton btnGo;
        HtmlSelect cboWebSite;
        HtmlSelect cboSiteLists;

        // 为加入客户端静态代码而准备的
        private const string ByeByeIncludeScriptKey = "myByeByeIncludeScript";
        private string EmbeddedScriptFormat = 
            "<script language=javascript>function ByeBye(){alert('Bye Bye'); }</script> ";

        private void NavigateAndSearch_PreRender(object sender , System.EventArgs e )
        {   
            RegisterCommonScript();
        }
        public NavigateAndSearch()
        {
            this.PreRender += new EventHandler(NavigateAndSearch_PreRender);
        }


        protected void RegisterCommonScript() 
        {
            //Embedded Client Script 
            if(!Page.IsClientScriptBlockRegistered(ByeByeIncludeScriptKey))
                Page.RegisterClientScriptBlock(ByeByeIncludeScriptKey,
                    EmbeddedScriptFormat);

        }


        protected override void CreateChildControls ()
        {
            int i,j ;
            ListItem li;
            cboWebSite = new HtmlSelect ();
            cboSiteLists =new HtmlSelect();
            btnGo =new HtmlInputButton ();
            btnGo.Value="    打开    ";
            btnGo.Attributes.Add("onClick","onClick()");
            //取出所有网站
            SPSite mySite = new SPSite(text);
            SPWeb web = mySite.OpenWeb();
            for (i=0;i<web.Webs.Count;i++)
            {
                SPWeb myweb = web.Webs[i];
                li=new ListItem ();
                li.Text=myweb.Title.ToString();
                li.Value=myweb.Url.ToString();
                cboWebSite.Items.Add(li);    
            }    

            cboWebSite.Attributes.Add("onChange","onComboChange()");
            cboWebSite.Attributes.Add ("ID","cboSite");            
            cboSiteLists.Attributes.Add("ID","cboList");
            cboSiteLists.Attributes.Add("style","140");
            cboWebSite.Attributes.Add("style","140");
            Controls.Add(cboWebSite);
            Controls.Add(cboSiteLists );
            Controls.Add(btnGo);

           //需要在这里改变一个客户端的代码EmbeddedScriptFormat
            EmbeddedScriptFormat =     "<script language=javascript>";
            EmbeddedScriptFormat += " function onComboChange(){";
            EmbeddedScriptFormat += "switch(document.all.cboSite.options[document.all.cboSite.selectedIndex].text)";
            EmbeddedScriptFormat +="{";
            for (i=0;i<web.Webs.Count;i++)
            {
                EmbeddedScriptFormat  += "case '" + web.Webs[i].Title.ToString() + "':"; 
                SPSite llSite=new SPSite(web.Webs[i].Url);
                SPWeb llweb=llSite.OpenWeb();
                for (j=0;j<llweb.Lists.Count;j++)
                {
                    SPList mylist=llweb.Lists[j];
                    if (j==0)
                    {
                        EmbeddedScriptFormat  += " document.all.cboList.options[" + j.ToString() + "]=new Option('" + 
                            mylist.Title.ToString() + "','" + mylist.DefaultViewUrl + "',true,false);";
                    }
                    else
                    {
                        EmbeddedScriptFormat  += " document.all.cboList.options[" + j.ToString() + "]=new Option('" + 
                            mylist.Title.ToString() + "','" + mylist.DefaultViewUrl + "',false,false);";
                    }
                }
                EmbeddedScriptFormat  +="break;";
            }
            EmbeddedScriptFormat +="}}";
            EmbeddedScriptFormat += "function onClick(){";
            EmbeddedScriptFormat += " window.open('http://portol" + 
                            "' + document.all.cboList.options[document.all.cboList.selectedIndex].value)";
            EmbeddedScriptFormat  += "}</script>";
            
        }