asp.net & javascript

Hi Guys,
I have a aspx page which contain element that call javascript function:

Here is the example:
 <asp:Button ID="btnClose" runat="server" CssClass="btn btn-default" Text="Close" OnClientClick="javascript:delCookie('hdnMenuIds');delCookie('hdnMenuIdsOld');" visible="false"/>

//javascript function
  function delCookie(name) {          
                document.cookie = name + '=;expires=Thu, 01 Jan 1970 00:00:01 GMT;';
            };

Open in new window

The problem I have with this concept is xss/ cross site vulnerability.
I would like to know if you have any idea to secure this function?

N.B - this function been called by many button in the app so please try giving me solution for the javascript function itself.

Thank you in advance.
LVL 1
Moti Mashiah.NET DeveloperAsked:
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MrunalCommented:
Hi Moti,
Are you sure both JavaScript functions are getting called?

I see that button is Visible='false', so it will not render respective html on browser.

Also please share what error you are getting?
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Moti Mashiah.NET DeveloperAuthor Commented:
Thanks
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