怎么用webBrowser设置asp页面checkbox选项

如何用webBrowser设置asp页面checkbox选项
<input   name= "menberid "   type= "checkbox "   id= "menberid "   value= "1 "   />
<input   name= "menberid "   type= "checkbox "   id= "menberid "   value= "2 "   />
<input   name= "menberid "   type= "checkbox "   id= "menberid "   value= "3 "   />
<input   name= "menberid "   type= "checkbox "   id= "menberid "   value= "4 "   />

我想让程序设置为value= "3 "的checkbox选中，如何实现，谢谢

[解决办法]
var
e: mshtml.IHTMLInputElement;
begin
e:=doc3.getElementById( 'menberid ') as IHTMLInputElement;
if e <> nil then
e.checked:=true;
end;