function hideall() {
 	if (navigator.appName=='Microsoft Internet Explorer')
			{
              document.all.submenu1.style.visibility = 'hidden';
			  document.all.submenu2.style.visibility = 'hidden';
			  document.all.submenu2a.style.visibility = 'hidden';
			  document.all.submenu2b.style.visibility = 'hidden';
			  document.all.submenu3.style.visibility = 'hidden';
			  document.all.submenu4.style.visibility = 'hidden';
              document.all.btn_1.style.backgroundImage='';
			  document.all.btn_2.style.backgroundImage='';
			  document.all.btn_4.style.backgroundImage='';
			  document.all.btn_5.style.backgroundImage='';
			  document.all.btn_7.style.backgroundImage='';
			}
	else	{
		     if (parseFloat(navigator.appVersion)>=5)
			 {
		       a = document.getElementById('submenu1')
		       a.style.visibility='hidden';
		       a = document.getElementById('submenu2')
		       a.style.visibility='hidden';
		       a = document.getElementById('submenu2a')
		       a.style.visibility='hidden';
			   a = document.getElementById('submenu2b')
		       a.style.visibility='hidden';
		       a = document.getElementById('submenu3')
		       a.style.visibility='hidden';
		       a = document.getElementById('submenu4')
		       a.style.visibility='hidden';

		    }
		   else
		   	{
		       document.layers.submenu1.visibility = 'hidden';
		       document.layers.submenu2.visibility = 'hidden';
		       document.layers.submenu2a.visibility = 'hidden';
			   document.layers.submenu2b.visibility = 'hidden';
		       document.layers.submenu3.visibility = 'hidden';
		       document.layers.submenu4.visibility = 'hidden';
	 		}
			}
 }


 function activ(what) {
 	
	hideall();
	
 	if (navigator.appName=='Microsoft Internet Explorer')
			{
		     switch(what) {
			 case 1: { 
		              document.all.btn_1.style.backgroundImage='url(pict/menu_fon_activ.gif)';
					  break;
					  }
			 case 2: { 
					  document.all.btn_2.style.backgroundImage='url(pict/menu_fon_activ.gif)';
					  document.all.submenu1.style.visibility = 'visible';
					  break;
					  }
			 case 4: { 
					  document.all.btn_4.style.backgroundImage='url(pict/menu_fon_activ.gif)';
					  document.all.submenu2.style.visibility = 'visible';
					  break;
					  }
			 case 5: { 
					  document.all.btn_4.style.backgroundImage='url(pict/menu_fon_activ.gif)';
					  document.all.submenu2a.style.visibility = 'visible';
					  break;
					  }
			case 6: { 
					  document.all.btn_4.style.backgroundImage='url(pict/menu_fon_activ.gif)';
					  document.all.submenu2b.style.visibility = 'visible';
					  break;
					  }		  			  
			 case 10: { 
					  document.all.btn_5.style.backgroundImage='url(pict/menu_fon_activ.gif)';
					  document.all.submenu3.style.visibility = 'visible';
					  break;
					  }			  
			 case 12: { 
					  document.all.btn_7.style.backgroundImage='url(pict/menu_fon_activ.gif)';
					  document.all.submenu4.style.visibility = 'visible';
					  break;
					  }			  
					  }
			 }
		else
			{
			 switch(what) {
			 case 2: { 
			     if (parseFloat(navigator.appVersion)>=5) {
		    	   a = document.getElementById('submenu1')
			       a.style.visibility='visible';
		    		 }
		   		 else {document.layers.submenu1.visibility = 'visible';}
					  break;
					  }
			 case 4: { 
			     if (parseFloat(navigator.appVersion)>=5) {
		    	   a = document.getElementById('submenu2')
			       a.style.visibility='visible';
		    		 }
		   		else {document.layers.submenu2.visibility = 'visible';}
					  break;
					  }
			 case 5: { 
			     if (parseFloat(navigator.appVersion)>=5) {
		    	   a = document.getElementById('submenu2a')
			       a.style.visibility='visible';
		    		 }
		   		else {document.layers.submenu2a.visibility = 'visible';}
					  break;
					  }
			case 6: { 
			     if (parseFloat(navigator.appVersion)>=5) {
		    	   a = document.getElementById('submenu2b')
			       a.style.visibility='visible';
		    		 }
		   		else {document.layers.submenu2b.visibility = 'visible';}
					  break;
					  }		  			  
			 case 10: { 
			     if (parseFloat(navigator.appVersion)>=5) {
		    	   a = document.getElementById('submenu3')
			       a.style.visibility='visible';
		   			 }
		  		 else {document.layers.submenu3.visibility = 'visible';}
					  break;
					  }			  
			 case 12: { 
			     if (parseFloat(navigator.appVersion)>=5) {
		    	   a = document.getElementById('submenu4')
			       a.style.visibility='visible';
		    		 }
		   		else {document.layers.submenu4.visibility = 'visible';}
					  break;
					 }			  
			}
			}
 }