function showdiv(showid){ 
  var idarray= new Array("title","profile","portfolio","contact","ie6_banner"); 
  for(i=0; i<idarray.length; i++){ 
    if(idarray[i] == showid){ 
      document.getElementById(showid).style.visibility="visible"; 
    }
    else{ 
      document.getElementById(idarray[i]).style.visibility="hidden"; 
    } 
  } 
}