jQuery(document).ready(function($){ 
 
 var objects = document.getElementsByTagName("ie:menuitem");     
 for (var i = 0; i < objects.length; i++) {        
    itm = objects[i]; 
    if ($('#' + itm.id).attr("text") == "Sign in as Different User") 
    { 
        $('#' + itm.id).remove(); 
    } 
} 
 
})