var OnOff = 0;


function AllIsotops() {

   var Elements = document.getElementById( 'isotops' );
   var Isotops  = Elements.getElementsByTagName( 'DIV' );

   var display;

   if ( !OnOff ) {
      display = 'block';
      OnOff   = 1;
   }

   else {
      display = 'none';
      OnOff   = 0;
   }

   for ( var i = 0; i < Isotops.length; i++ ) {

    Isotops[ i ].style.display = display;

   }   

}


function Isotop( Item ) {

  var Element = document.getElementById( 'isotop' + Item );

  with ( Element ) {

    if ( style.display == 'none' ) { style.display = 'block'; }
    else                           { style.display = 'none'; }

  }

}