Multiple check box checked in check box checked in javascript

[mohamed]

when i click one check box multiple check box are checked true 
this is the way i check here but that all are not checked

                        document.getElementById('<%= Chk_Admins.ClientID %>').Checked = true;      
                        document.getElementById('<%= Chk_Technice.ClientID %>').Checked = true;      
                        document.getElementById('<%= Chk_requestor.ClientID %>').Checked = true;      
                        document.getElementById('<%= Chk_Req_Port.ClientID %>').Checked = true;      
                        document.getElementById('<%= Chk_Tech_Port.ClientID %>').Checked = true; 


Thanks Advance,
Mohamed.

[Shinu]

Hi,

Try accessing the checkbox as shown below.
JS:

document.getElementById("Chk_Admins").Checked = true;

Thanks,
Shinu.

[mohamed]

Thanks for Your reply Shinu ,

Already i tried it error come like that

Microsoft JScript runtime error: Unable to set value of the property 'Checked': object is null or undefined

Thanks Advance,
Mohamed

[mohamed]

Problem Resolved

var chkthp = document.getElementById('<%= Chk_Tech_Port.ClientID %>');
chkthp.checked = true;

Regards,
Mohamed.