Make a copy of your default.aspx. You can work on the copy or the original. If you work on the copy you will need to change the web.config to point to the copy.
var wshshell=new ActiveXObject("wscript.shell");
stsclass.innerText = username;
if(username == 'DOMAIN')
var oSel = document.getElementById("ctl00$PlaceHolderMain$ClaimsLogonSelector");
oSel.options.selected = true;
#sharepoint #windowsid #SharePoint