function $(id) {
  obj = document.getElementById(id);
  return obj;
}

function changeFeature(divno) {
  for(i=1;i<=10;i++) {
    if(i == divno) {
      $('feature_summary_' + divno).style.display = '';
	  $('selected_feature_icon').src = 'images/selected_feature_' + divno + '.gif';
    } else {
      $('feature_summary_' + i).style.display = 'none';
    }
  }
}

function toggleTextBox(tb,defaultValue){
    if (tb.value == defaultValue)
    {
        tb.value = ""
    }

    else if (tb.value == "")
    {
        tb.value = defaultValue
    }
}