function getURLParam(strParamName){
  var strReturn = "";
  var strHref = window.location.href;
  if ( strHref.indexOf("?") > -1 ){
    var strQueryString = strHref.substr(strHref.indexOf("?")).toLowerCase();
    strQueryString = strQueryString.replace("?zoom_highlight=", "");
    strQueryString = strQueryString.replace(/%2a/g, "" );
    strQueryString = strQueryString.replace(/%3f/g, "" );
    strQueryString = strQueryString.replace(/x2B/g, " " );
    strReturn = strQueryString;
  }
  return strReturn;
}

document.searchhi.h.value = getURLParam("zoom_highlight");