function toggleLayer( whichLayer, whichStyle )
{
  var elem, vis;
  if( document.getElementById ) // this is the way the standards work
    elem = document.getElementById( whichLayer );
  else if( document.all ) // this is the way old msie versions work
      elem = document.all[whichLayer];
  else if( document.layers ) // this is the way nn4 works
    elem = document.layers[whichLayer];
  vis = elem.style;
  
  vis.display = whichStyle;
}

function open_veftv(div_active){
	var sets = document.getElementsByTagName("div");
	for (var i = 0; i < sets.length; i++)
	{
		if (sets[i].id.indexOf("veftv_") != -1){			
			if(sets[i].id.indexOf(div_active) != -1){
				toggleLayer(sets[i].id,'block');
			}else{
				toggleLayer(sets[i].id,'none');
			}			
		}
	}
}