var canSwitch = false;
if (parseInt(navigator.appVersion) >= 5 && navigator.appName != "Opera" || navigator.userAgent.indexOf("MSIE") != -1) {
    canSwitch = true;
}

plus = new Image();     plus.src = "images/point_gw.gif";
minus = new Image();    minus.src = "images/point_gw.gif";

function show(kat, imgname){
if(canSwitch){
  var podmenu;
  if (podmenu = document.getElementById(kat)) {
	  var visible = (podmenu.style.display!='none');
	  if(visible){
    	  podmenu.style.display='none';
	  }else{
    	  podmenu.style.display='block';
	  }
  }
}
return false;
}