function loadExternalJs()
{
    var oNewScript = document.createElement("script");
    oNewScript.src = '/js/some.js';
    oNewScript.type = 'text/javascript';
 
    if ($.browser.msie)
    {
        oNewScript.onreadystatechange = function(){
            alert('loaded');
        };
    }
    else
    {
        oNewScript.onload = function(){
            alert('loaded');
        };
    }
    document.getElementsByTagName("head")[0].appendChild(oNewScript);
 
    return;
}