// Ye old Scott Andrew addEvent functions..
function addEvent(obj, evType, fn, useCapture){
        if (obj.addEventListener){
                obj.addEventListener(evType, fn, useCapture);
                return true;
        } else if (obj.attachEvent){
                var r = obj.attachEvent("on"+evType, fn);
                return r;
        }
        return false;
}

function removeEvent(obj, evType, fn, useCapture){
        if (obj.removeEventListener){
                obj.removeEventListener(evType, fn, useCapture);
                return true;
        } else if (obj.detachEvent){
                var r = obj.detachEvent("on"+evType, fn);
                return r;
        }
        return false;
}

// Unobtrusive scroller object
var fdScroller = {
        scrollLoop:false,
        scrollInterval:null,
        currentBlock:null,
        lastY:0,
        requestedY:0,
        init: function() {
                var lnks = document.getElementsByTagName('a');
                var removeLoc = window.location + ' ';

                // strip any #target, force a String cast
                if(removeLoc.indexOf('#') != -1) {
                        removeLoc = removeLoc.substr(0, removeLoc.indexOf('#'));
                } else {
                        removeLoc = removeLoc.substr(0, removeLoc.length - 1);
                }

                for(var i = 0, lnk; lnk = lnks[i]; i++) {
                        tmploc = lnk.href.replace(removeLoc,'');
                        if(tmploc.charAt(0) == '#' && !lnk.onclick)
                        {
                        	lnk.onclick = fdScroller.initScroll;
                        }
                }
        },
        getWindowHeight: function(){
                var myHeight = 0;
                if( typeof( window.innerWidth ) == 'number' ) {
                        //Non-IE
                        myHeight = window.innerHeight;
                } else if( document.documentElement &&
                                ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
                        //IE 6+ in 'standards compliant mode'
                        myHeight = document.documentElement.clientHeight;
                } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
                        //IE 4 compatible
                        myHeight = document.body.clientHeight;
                }
                return myHeight;
        },
        getScrollLeft: function(){
                if(document.all) return (document.documentElement.scrollLeft) ? document.documentElement.scrollLeft : document.body.scrollLeft;
                else return window.pageXOffset;
        },
        getScrollTop: function(){
                if(document.all) return (document.documentElement.scrollTop) ? document.documentElement.scrollTop : document.body.scrollTop;
                else return window.pageYOffset;
        },
        getElementYpos: function(el){
                var y = 0;
                while(el.offsetParent){
                        y += el.offsetTop
                        el = el.offsetParent;
                }
                return y;
        },
        initScroll: function(e){
                var targ;

                if (!e) var e = window.event;
                if (e.target) targ = e.target;
                else if (e.srcElement) targ = e.srcElement;
                if (targ.nodeType == 3) targ = targ.parentNode;

                if(targ.href && targ.href.indexOf('#') != -1) {
                        var where = targ.href.substr(targ.href.indexOf('#')+1,targ.href.length);
                        fdScroller.currentBlock = document.getElementById(where);
                        if(!fdScroller.currentBlock) return;

                        var documentHeight = document.getElementsByTagName('body').offsetHeight;
                        var windowHeight = fdScroller.getWindowHeight();
                        var ypos = fdScroller.getElementYpos(fdScroller.currentBlock);
                        if(ypos > documentHeight - windowHeight) ypos = documentHeight - windowHeight;
                        fdScroller.requestedY = ypos;
                        fdScroller.scroll();
                }

                return false;
        },
        scroll: function(){
                var left = fdScroller.getScrollLeft();
                var top  = fdScroller.getScrollTop();

                if(Math.abs(top-fdScroller.requestedY) <= 1){
                        window.scrollTo(0,fdScroller.requestedY);
                        fdScroller.lastY = -1;
                } else {
                        fdScroller.lastY = top;
                        window.scrollTo(0, Math.round(top+((fdScroller.requestedY-top)/2)));
                        setTimeout(fdScroller.scroll,50);
                }
        }
}


// You know the onload score...
window.onload = function() 
{
        // Basic runtime environment check
        if(!document.getElementById) return;
        fdScroller.init();
}