/* Fragment Highlight version 0.1 */

//*** This JavaScript highlight code is copyright 2003 by David Dorward; http://dorward.me.uk
//*** Re-use or modification permitted provided the previous line is included and
//*** modifications are indicated

/*********** Start of JavaScript Library *********/

//*** This JavaScript library is copyright 2002 by Gavin Kistner and Refinery; www.refinery.com
//*** Re-use or modification permitted provided the previous line is included

//Adds a new class to an object, preserving existing classes
function AddClass(obj, cName) { KillClass(obj, cName); return obj.className += (obj.className.length > 0 ? ' ' : '') + cName; }

//Removes a particular class from an object, preserving other existing classes.
function KillClass(obj, cName) { return obj.className = obj.className.replace(new RegExp("^" + cName + "\\b\\s*|\\s*\\b" + cName + "\\b", 'g'), ''); }

/*********** End of JavaScript Library ***********/

/* Fragment Highlight */

/* Indicates area that has been linked to if fragment identifiers have
* been used. Especially useful in situations where a short fragment
* is near the end of a page. */

var fragHLed = '';
var fragExclude = ('header');

Array.prototype.search = function(myVariable) { for (x in this) if (x == myVariable) return true; return false; }

/* Highlight link target if the visitor arrives at the page with a # */

function fragHLload() {
    fragHL(location.hash.substring(1));
}

/* Highlight link target from an onclick event after unhighlighting the old one */

function fragHL(frag) {
    if (fragHLed.length > 0 && document.getElementById(fragHLed)) {
        KillClass(document.getElementById(fragHLed), 'fragment');
    }
    if (frag.length > 0 && document.getElementById(frag)) {
        fragHLed = frag;
        AddClass(document.getElementById(frag), 'fragment');
    }
}

/* Add onclick events to all <a> with hrefs that include a "#"  */

function fragHLlink() {
    if (document.getElementsByTagName) {
        var an = document.getElementsByTagName('a');
        for (i = 0; i < an.length; i++) {
            if (an.item(i).getAttribute('href').indexOf('#') >= 0) {
                var fragment = an.item(i).getAttribute('href').substring(an.item(i).getAttribute('href').indexOf('#') + 1);
                if (fragExclude.search(fragment)) {
                    var evn = "fragHL('" + fragment + "')";
                    var fun = new Function('e', evn);
                    an.item(i).onclick = fun;
                }
            }
        }
    }
}

/* Init the script */

window.onload = function() {
    fragHLload();
    fragHLlink();
};