/************** Zoom effect JS ****************/

// init arrays
var scrollers = Array;
scrollers['headerimage_resource'] = { timer: null };
//scrollers['featureslide'] = { timer: null };
var curSlide = 1;

// easing
function cubicInOut(t, b, c, d) {
    if ((t /= d / 2) < 1) return c / 2 * t * t * t + b;
    return c / 2 * ((t -= 2) * t * t + 2) + b;
}

// easing
function sineInOut(t, b, c, d) {
    return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;
}

// perform the move	
function move(scroll, container) {
    if (scroll.time > scroll.duration) {
        clearInterval(scrollers[container].timer);
        scrollers[container].timer = null;
    }
    else {
        element = document.getElementById(scroll.container);
        element.scrollLeft = cubicInOut(scroll.time, scroll.begin, scroll.change, scroll.duration);
        scroll.time++;
    }
}

// initialise the move
function startMove(container, pos, duration) {
    if (scrollers[container].timer != null) {
        clearInterval(scrollers[container].timer);
        scrollers[container].timer = null;
    }

    start = document.getElementById(container).scrollLeft;
    end = pos;
    begin = document.getElementById(container).scrollLeft;

    scrollers[container].time = 0;
    scrollers[container].begin = begin;
    scrollers[container].change = end - start;
    scrollers[container].duration = duration;
    scrollers[container].container = container;
    scrollers[container].timer = setInterval(function() { move(scrollers[container], container); }, 15);
}


function getImgPath(e, state) {
    if (!(imgSRC = getPattern(document.getElementById(e).childNodes[0].currentStyle.backgroundImage, "\"(.*)_(.*)\.gif\"")))
        imgSRC = getPattern(document.getElementById(e).childNodes[0].currentStyle.filter, "src='(.*)_(.*)\.gif',");
    if (state)
        return imgSRC + "_on.gif";
    else
        return imgSRC + "_off.gif";
    //return imgSRC+".png";
}


// set active tabs
function setNavClass(navID) {
    if (/MSIE (5\.5|6\.)/.test(navigator.userAgent)) {
        fixElement('hn_resource_page1', getImgPath('hn_resource_page1', false));
        fixElement('hn_resource_page2', getImgPath('hn_resource_page2', false));
        fixElement(navID, getImgPath(navID, true));
    }
    else {
        document.getElementById('hn_resource_page1').className = 'off';
        document.getElementById('hn_resource_page2').className = 'off';
        document.getElementById(navID).className = 'on';
    }
}

// change the navigation (perform all functions)
function changeNav(nav) {
    if (nav == 1) {
        if (document.getElementById('headerimage_resource') != null) {
            startMove('headerimage_resource', 0, 40);
            setNavClass('hn_resource_page1');
            window.location.hash = '#page1';
        }
        return false;
    }
    if (nav == 2) {
        if (document.getElementById('headerimage_resource') != null) {
            startMove('headerimage_resource', 948, 40);
            setNavClass('hn_resource_page2');
            window.location.hash = '#page2';
        }

        return false;
    }
}


function fixElement(e, imgSrc) {
    element = document.getElementById(e).childNodes[0];
    if (imgSrc) {
        element.style.backgroundImage = "none";
        element.style.backgroundColor = "transparent";
        element.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" +
		imgSrc + "',sizingMethod='crop')";
    }
}

function getPattern(inputString, regPat) {
    //alert("PAT: "+regPat);
    //alert("INP: "+inputString);
    var reg = new RegExp(regPat, "i");
    var ar = reg.exec(inputString);
    if (ar != null) {
        // alert("MATCH: "+ar[1]);
        return ar[1];
    }
    return null;
}