function nahled () {
   document.getElementById( 'view_nahled_closer' ).style.display = "block";
   document.getElementById( 'view_nahled' ).style.display = "block";
}
function hide () {
   document.getElementById( 'view_nahled_closer' ).style.display = "none";
   document.getElementById( 'view_nahled' ).style.display = "none";
}
var start = true;
function init_change_model ( path ) {
  if ( start ) {
    change_model ( 100 , 0 , path );
    start = false;
  }
}
function change_model( old_visibility , new_visibility , path ) {
   if ( old_visibility != 0 ) {
     old_visibility += -5;
     document.getElementById( 'modelvelkafotka' ).style.opacity = old_visibility / 100;
     document.getElementById( 'modelvelkafotka' ).style.filter = "alpha(opacity="+old_visibility+")";
     setTimeout("change_model("+old_visibility+",0,'"+path+"')", 50 );
   }else if ( old_visibility == 0 && new_visibility == 0 ) {
     new_visibility += 5;
     document.getElementById( 'modelvelkafotka' ).src = "/model/big/"+path;
     // 
     img = new Image();
     img.src = "/model/big/"+path;

     if ( img.complete )setTimeout("change_model(0,"+new_visibility+",'"+path+"')", 50 );
     else setTimeout("change_model(0,0,'"+path+"')", 50 );

   }else if ( new_visibility != 100 ) {
     new_visibility += 5;
     document.getElementById( 'modelvelkafotka' ).style.opacity = new_visibility / 100;
     document.getElementById( 'modelvelkafotka' ).style.filter = "alpha(opacity="+new_visibility+")";
     setTimeout("change_model(0,"+new_visibility+",'"+path+"')", 50 );
   } else {
     start = true;
   }
}