BrowserName=navigator.appName;
 BrowserVersion=parseInt(navigator.appVersion);
 if (BrowserName=="Netscape" && BrowserVersion>=3)
  useable="yes";
 else
  useable="yes";

button10=new Button("images/aloldal/menu_1_off.jpg","images/aloldal/menu_1_on.jpg");
button11=new Button("images/aloldal/menu_2_off.jpg","images/aloldal/menu_2_on.jpg");
button12=new Button("images/aloldal/menu_3_off.jpg","images/aloldal/menu_3_on.jpg");
button13=new Button("images/aloldal/menu_4_off.jpg","images/aloldal/menu_4_on.jpg");


 function Button(norm_src,sel_src)
 {
  if (useable=="yes")
  {
   this.norm=new Image();
   this.sel=new Image();
   this.norm.src=norm_src;
   this.sel.src=sel_src;
  }
 }

 function TurnToSel(ImageName)
 {
  if (useable=="yes")
  {
   NewSrc=eval(ImageName+".sel.src");
   document[ImageName].src=NewSrc;
  }
 }

 function TurnToNorm(ImageName)
 {
  if (useable=="yes")
  {
   NewSrc=eval(ImageName+".norm.src");
   document[ImageName].src=NewSrc;
  }
 }