var Common =
{
    baseUrl: null
   
    , setBaseUrl: function(url)
    {
        Common.baseUrl = url || jQuery('script[@src$=js/path.js]')
            .attr('src')
            .replace(/js\/path.js$/,'');
    }
    
    , url: function(url)
    {
        return this.baseUrl+url.replace(/^\/+/, '');
    }
}
 
Common.setBaseUrl();