function makewindow(url,name,wi,hi,scroll) 
{  
    if (!scroll) { scroll = 0; }
    mywin = window.open(url + '?referrer= '+window.location.href,name,'width=' + wi + ',height=' + hi + ',toolbar=0,location=0,directories=0,status=1,menubar=0,scrollbars=' + scroll); 
}

function onFeedbackClick(url)
{   
    makewindow(url, 'feedback','640','800','0'); 
}