var menu = 
      { 
          clicked:  null, 
          list:     [], 
          
          add:      function(id,out,over,click) 
          { 
              var node = document.getElementById(id); 
              if(!node) 
              { 
                  alert('podałeś złe id'); 
                  return; 
              } 
                var o_src       = this;
		var image	= id
              node.onclick      = function(){o_src.click(this, click)}; 
              node.onmouseover  = function(){o_src.change(this, over)}; 
              node.onmouseout   = function(){o_src.change(this, out)}; 
          }, 
          
          change:   function(node,new_src) 
          { 
              if(this.clicked==node.id) 
              { 
                  return; 
              } 
              node.src = new_src; 
          }, 
          
          click:    function(node, click) 
          { 
              var old = this.clicked; 
              this.clicked = node.id 
              if(old) 
              { 
             document.getElementById(old).onmouseout(); 
              } 
              node.src = click; 
          }
      } 
       
      function load() 
      { 
          menu.add('opisinw','images/opisinw_1.jpg','images/opisinw_2.jpg','images/opisinw_3.jpg');
	  menu.add('etinw','images/etinw_1.jpg','images/etinw_2.jpg','images/etinw_3.jpg');
          menu.add('projdom','images/projdom_1.jpg','images/projdom_2.jpg','images/projdom_3.jpg'); 
          menu.add('listinw','images/listinw_1.jpg','images/listinw_2.jpg','images/listinw_3.jpg');
          menu.add('onas','images/onas_1.jpg','images/onas_2.jpg','images/onas_3.jpg'); 
          menu.add('planzagosp','images/planzagosp_1.jpg','images/planzagosp_2.jpg','images/planzagosp_3.jpg');
          menu.add('kont','images/kont_1.jpg','images/kont_2.jpg','images/kont_3.jpg'); 
          menu.add('okol','images/okol_1.jpg','images/okol_2.jpg','images/okol_3.jpg'); 
          menu.add('galer','images/galer_1.jpg','images/galer_2.jpg','images/galer_3.jpg'); 
      }