var show_swf = true;
function swf_s(f){
  show_swf = f;
  if (document.all){ // if using ie
    document.all['centerflash'].style.display = f?"block":"none";	
  }
  else if (document.getElementById){ // if using netscape6
  	document.getElementById('centerflash').style.display = f?"block":"none";	
  }
}