function open_window(url,tip,w,h,topx,topy,alignx,aligny,toolbar,location,directories,status,menubar,scrollbars,resizable)
{
var features;
if (tip=="%"){w=screen.availWidth*w/100; h=screen.availHeight*h/100;}
if (w>screen.availWidth){w=screen.availWidth;}
if (h>screen.availHeight){h=screen.availHeight;}
if (alignx=="center"){topx = (screen.availWidth - w) / 2;}
if (aligny=="center"){topy = (screen.availHeight - h) / 2;}

features = "toolbar=" + toolbar + ",location=" + location + ",directories=" + directories;
features = features + ",status=" + status + ",menubar=" + menubar + ",scrollbars=" + scrollbars;
features = features +  ",resizable=" + resizable + ",width=" + w + ",height=" + h;
features = features +  ",top=" + topy + ",left=" + topx;

window.open(url,null,features);
//window.status = features;
}