function search()
{
  var str_search=document.search.searchstring.value; 
  if (validateForm(str_search)) {
    if (document.search.engine[1].checked == true) {
      var url=encodeURI("http://www.clicaps.ethz.ch/fmi/xsl/results_de.xsl?-grammar=fmresultset&-db=Metasearch&-lay=WWW&Sprache=deutsch&Suchtyp=simple&Query=" + str_search + "&-new");
      window.location.href=url;
    }
    else if (document.search.engine[0].checked == true) {
      var url="http://www.infochembio.ethz.ch/cgi-bin/htsearch?method=and&format=builtin-long&sort=score&config=htdig&restrict=&exclude=&words=" + escape(str_search);
      window.location.href=url;
    }
    else {
      alert('Fehler: Falsch definierte Searchengine');
    }
  }
  else {
  }
}

function validateForm(str) {
  if (isNotEmpty(str)) {
    var strippedQuery = str.replace(/ /g,"");
    if (strippedQuery == "*") { return false; } else { return true; }
  } else {
    return false;
  }
}

function isNotEmpty(str) {
  if (str == null || str.length == 0) { return false; } else { return true; }
}