function pop(plik,w,h){
    okno = null;
    if(window.screen){
        aw = screen.availWidth;
	ah = screen.availHeight;
    }
    else{
        aw=640;
        ah=480;
   }
    if(h>800){
        sb = "yes";
    } else {
	sb = "auto";
    }

dane="width="+w+",height="+h+",left="
+(aw-w)/2+",top="
+(ah-h)/2 
+",toolbar=no,location=no,directories=no,"
+"status=yes,menubar=no,"
+"scrollbars="+sb+",resizable=yes";
okno=window.open(plik,'pop',dane);
}