function changePic(path, picture)
{
   switch (path)
   {
      case 1:
         document.home.src = picture;
		 break;
      case 2:
         document.whatwedo.src = picture; 
		 break;	   
	  case 3:
         document.newsletters.src = picture; 
		 break;	   
	  case 4:
         document.registration.src = picture; 
		 break;
	  case 5:
         document.courses.src = picture; 
		 break;
	  case 6:
         document.contacts.src = picture; 
		 break;		    
	  case 7:
         document.newsletter.src = picture; 
		 break;		
      case 8:
         document.contact_button.src = picture; 
		 break;		
	  case 9:
        document.clear_button.src = picture; 
		break;		 
	  case 10:
        document.reg_button.src = picture; 
		break;	   
      default:
         document.writeln("error.");
   }
}