function popup(url,title,feature){
    if( !feature ){ 
        feature = "top='100px', left='100px', width='600px', height='600px',toolbars=true, scrollbars=true, status=true, menubar=true, resizable=true";
    }
    var newwin = window.open( url, title, feature);
	if (window.focus) {newwin.focus();}
}