/*
 * This is the function that actually highlights a text string by
 * adding HTML tags before and after all occurrences of the search
 * term. You can pass your own tags if you'd like, or if the
 * highlightStartTag or highlightEndTag parameters are omitted or
 * are empty strings then the default <font> tags will be used.
 */
function doHighlight(bodyText, searchTerm, highlightStartTag, highlightEndTag) 
{
  // the highlightStartTag and highlightEndTag parameters are optional
  if ((!highlightStartTag) || (!highlightEndTag)) {
    highlightStartTag = "<font style='color:#000000; border-bottom: 1px dotted #C0C0C0;'>";
    highlightEndTag = "</font>";
  }
  
  // find all occurences of the search term in the given text,
  // and add some "highlight" tags to them (we're not using a
  // regular expression search, because we want to filter out
  // matches that occur within HTML tags and script blocks, so
  // we have to do a little extra validation)
  var newText = "";
  var i = -1;
  var lcSearchTerm = searchTerm.toLowerCase();
  var lcBodyText = bodyText.toLowerCase();
    
  while (bodyText.length > 0) {
    i = lcBodyText.indexOf(lcSearchTerm, i+1);
    if (i < 0) {
      newText += bodyText;
      bodyText = "";
    } else {
      // skip anything inside an HTML tag
      if (bodyText.lastIndexOf(">", i) >= bodyText.lastIndexOf("<", i)) {
        // skip anything inside a <script> block
        if (lcBodyText.lastIndexOf("/script>", i) >= lcBodyText.lastIndexOf("<script", i)) {
          newText += bodyText.substring(0, i) + highlightStartTag + bodyText.substr(i, searchTerm.length) + highlightEndTag;
          bodyText = bodyText.substr(i + searchTerm.length);
          lcBodyText = bodyText.toLowerCase();
          i = -1;
        }
      }
    }
  }
  
  return newText;
}
 
 
/*
 * This is sort of a wrapper function to the doHighlight function.
 * It takes the searchText that you pass, optionally splits it into
 * separate words, and transforms the text on the current web page.
 * Only the "searchText" parameter is required; all other parameters
 * are optional and can be omitted.
 */
function highlightSearchTerms(searchText, treatAsPhrase, warnOnFailure, highlightStartTag, highlightEndTag)
{
  // if the treatAsPhrase parameter is true, then we should search for 
  // the entire phrase that was entered; otherwise, we will split the
  // search string so that each word is searched for and highlighted
  // individually
  if (treatAsPhrase) {
    searchArray = [searchText];
  } else {
    searchArray = searchText.split(" ");
  }
  
  if (!document.getElementById("searchResultsItemsList") || typeof(document.getElementById("searchResultsItemsList").innerHTML) == "undefined") {
    if (warnOnFailure) {
      alert("Sorry, for some reason the text of this page is unavailable. Searching will not work.");
    }
    return false;
  }
  
  var bodyText = document.getElementById("searchResultsItemsList").innerHTML;
  for (var i = 0; i < searchArray.length; i++) {
    bodyText = doHighlight(bodyText, searchArray[i], highlightStartTag, highlightEndTag);
  }
  
  document.getElementById("searchResultsItemsList").innerHTML = bodyText;
  return true;
}
 
 
/*
 * This displays a dialog box that allows a user to enter their own
 * search terms to highlight on the page, and then passes the search
 * text or phrase to the highlightSearchTerms function. All parameters
 * are optional.
 */
function searchPrompt(defaultText, treatAsPhrase, textColor, bgColor)
{
  // This function prompts the user for any words that should
  // be highlighted on this web page
  if (!defaultText) {
    defaultText = "";
  }
  
  // we can optionally use our own highlight tag values
  if ((!textColor) || (!bgColor)) {
    highlightStartTag = "";
    highlightEndTag = "";
  } else {
    highlightStartTag = "<font style='color:" + textColor + "; background-color:" + bgColor + ";'>";
    highlightEndTag = "</font>";
  }
  
  if (treatAsPhrase) {
    promptText = "Please enter the phrase you'd like to search for:";
  } else {
    promptText = "Please enter the words you'd like to search for, separated by spaces:";
  }
  
  searchText = prompt(promptText, defaultText);
 
  if (!searchText)  {
    alert("No search terms were entered. Exiting function.");
    return false;
  }
  
  return highlightSearchTerms(searchText, treatAsPhrase, true, highlightStartTag, highlightEndTag);
}
 
 
/*
 * This function takes a referer/referrer string and parses it
 * to determine if it contains any search terms. If it does, the
 * search terms are passed to the highlightSearchTerms function
 * so they can be highlighted on the current page.
 */
function highlightGoogleSearchTerms(referrer)
{
  // This function has only been very lightly tested against
  // typical Google search URLs. If you wanted the Google search
  // terms to be automatically highlighted on a page, you could
  // call the function in the onload event of your <body> tag, 
  // like this:
  //   <body onload='highlightGoogleSearchTerms(document.referrer);'>
  
  //var referrer = document.referrer;
  if (!referrer) {
    return false;
  }
  
  var queryPrefix = "q=";
  var startPos = referrer.toLowerCase().indexOf(queryPrefix);
  if ((startPos < 0) || (startPos + queryPrefix.length == referrer.length)) {
    return false;
  }
  
  var endPos = referrer.indexOf("&", startPos);
  if (endPos < 0) {
    endPos = referrer.length;
  }
  
  var queryString = referrer.substring(startPos + queryPrefix.length, endPos);
  // fix the space characters
  queryString = queryString.replace(/%20/gi, " ");
  queryString = queryString.replace(/\+/gi, " ");
  // remove the quotes (if you're really creative, you could search for the
  // terms within the quotes as phrases, and everything else as single terms)
  queryString = queryString.replace(/%22/gi, "");
  queryString = queryString.replace(/\"/gi, "");
  
  return highlightSearchTerms(queryString, false);
}
 
 
/*
 * This function is just an easy way to test the highlightGoogleSearchTerms
 * function.
 */
function testHighlightGoogleSearchTerms()
{
  var referrerString = "http://www.google.com/search?q=javascript%20highlight&start=0";
  referrerString = prompt("Test the following referrer string:", referrerString);
  return highlightGoogleSearchTerms(referrerString);
}



 function highlightSearchTxt() {

    searchForObj = document.getElementById("searchFor");
    
    if(searchForObj) {

       currTxt = searchForObj.innerHTML;
       highlightSearchTerms(currTxt);
       
    } // end if
 
 } // end function


 function SearchSubmit(e) {

    key = window.event ? e.keyCode : e.which;

    if(key == 13 && document.search_form.nav_area.value != "")
       SearchFormSubmit('');

 } // end funcion
 
 
 function SearchFormSubmit(v) {

   if(v == "")
      na = document.search_form.nav_area.value;
   else
      na = v;
      
   txt = document.getElementById(na + "_text").value;

   if(Remove_Spaces(txt) != "") {
   
      if(txt.length > 2) {
      
         vop1 = "";
         vop1a = "";
         s = 0;
         
         while(s > -1) {

           sOp1 = document.getElementById(na + "_op1["+s+"]");
           
           if(sOp1) {
            s++;
            if(sOp1.checked) {
               vop1 += vop1a + sOp1.value;
               vop1a = ",";
            }
           }
           else {
              s = -1;
           }           
           
         } // end while

         Op2 = document.getElementById(na + "_op2");
         Op3 = document.getElementById(na + "_op3");

         vop2 = "N";
         vop3 = "N";
         
         if(Op2) {
          if(Op2.checked) {
             vop2 = "Y";
          }
         } 
         
         if(Op3) {
          if(Op3.checked) {
             vop3 = "Y";
          }
         } 
         
         var pdim = BrwoserWidthHeight();
         document.search_form.text.value = txt;
         document.search_form.op1.value = vop1;
         document.search_form.op2.value = vop2;
         document.search_form.op3.value = vop3;
         document.search_form.bhdata.value = pdim.h;
         document.search_form.submit();
      
      }
      else {
         alert(document.getElementById(na + "_search_notes_nchars").innerHTML)
         document.search_form.nav_area.value = na;
         document.getElementById(na + "_text").focus();
      }
      
    } // end if  
       
 } // end function


 function SearchInputActions(v, na) {
   
   if(v == "0") {
   
      otxt = document.search_form.text.value;
      stxt = document.getElementById(na + "_text").value;

      if(otxt == stxt) {
         document.getElementById(na + "_text").value = "";
      }
            
   } // end if
      
   document.search_form.nav_area.value = na;
      
 } // end function
 

 function SearchResultSection(sid) {
 
   document.search_result.section_id.value = sid;
   document.search_result.submit();
 
 } // end function


 function SearchRecordsUrlNav(pn) {
 
   document.search_result.pagenumber.value = pn;
   document.search_result.submit();
 
 } // end function