function popup(win_url,win_name,win_scrollbars,win_width,win_height,win_top){
win_left = screen.width - win_width-30;
if(win_top > 0){
	if(eval(win_top)+eval(win_height) > screen.height){
	n = eval(win_top)+eval(win_height)-screen.height;
	win_top = eval(win_top)-n;
	}
}
    var win_data = "toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=" + win_scrollbars + ",resizable=1,width=" + win_width + ",height=" + win_height + ",left=" + win_left + ",top=" + win_top;
    nw = window.open(win_url,win_name,win_data);
}