function knopka_is(nm)
{ return this.name==nm?true:false; }

function knopka_def(href,_beg,_end)
{ if(this.img)
  document.write(""+(_beg?_beg:"")+"<a href=\""+(href?href:"")+"\">"+
	"<img id='"+this.name+"' src='"+this.img.src+"' border='0'"+
	" onmouseover=Knopki.move('"+this.name+"','over'); onmouseout=Knopki.move('"+this.name+"','out');"+
	"></img></a>"+(_end?_end:"")); 
  else document.write("<p>Кнопка '"+this.name+"' не создана!</p>");
}

function knopka_move(oper)
{ if(oper=="out")
  { document.images(this.name).src=this.img.src;
    this.sost="off";
  }
  else
  if((oper=="over") && (this.imgmove) && (this.sost=="off")) 
  { document.images(this.name).src=this.imgmove.src;
    this.sost="on";
  }
}

// --- knopki
function knopki_poisk(name)
{ var l;
  for(l=0;l<this.knopki.length;l++) 
  if(this.knopki[l].is(name)) 
  return (this.knopki[l].img?this.knopki[l]:false); 
  return false;
}

function knopki_def(name,href,_beg,_end)
{ kn=this.poisk(name);
  if(!kn) return;
  return kn.def(href,_beg,_end);
}

function knopki_move(name,oper)
{ kn=this.poisk(name);
  if(kn) kn.move(oper);
}

function knopki_add(nm,src,srcmove)
{ this.knopki.push(new TKnopka(nm,src,srcmove)); }

// --- constructors
function TKnopka(nm,src,srcmove)
{ if(src)
  { this.img=new Image;
    this.img.src=src;
  } else this.img=false;
  if(srcmove)
  { this.imgmove=new Image;
    this.imgmove.src=srcmove;
  } else this.imgmove=false;
  this.sost="off";
  this.name=nm;
  this.is=knopka_is;
  this.def=knopka_def;
  this.move=knopka_move;
}

function TKnopki()
{ this.knopki=new Array; 
  this.poisk=knopki_poisk;
  this.add=knopki_add;
  this.def=knopki_def;
  this.move=knopki_move;
}