browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
   version = "no";
   if (browserName == "Netscape" && browserVer >= 3) version = "ok";
   if (browserName == "Microsoft Internet Explorer" && browserVer >= 4) version = "ok";
   
nn4=(document.layers) ? true : false; 
ie4=(document.all) ? true : false; 
okno=null; 

function select(i,jak) {
if (jak=='on') {this_src=imgs_on[i].src;}
if (jak=='off') {this_src=imgs_off[i].src;}

  if (version == "ok")
  {
  	imgName="img_"+i;
   document[imgName].src = this_src;
  }

}



function okienko(w,h,nazwa) {
	if (okno) { 
 	  if (ie4) okno.close(); 
 	  else if (nn4) okno.closed; 
 	  okno=null 
 	}; 
	  okno=window.open(nazwa,'okno',"status=no,menubar=no,scrollbars=no,resizable=no, width="+w+", height="+h+", top=50,left=100");
}