/**
* common library of javascript functions
*/

function addEvent(obj, evType, fn)
{
    if (obj.addEventListener)
    {
        obj.addEventListener(evType, fn, true);
        return true;
    }
    else if (obj.attachEvent)
    {
        var r = obj.attachEvent("on" + evType, fn);
        return r;
    }
    else
    {
        return false;
    }
}

/**
* fix alpha pngs on a page (turn on transparency for IE)
*/
function fixAlphaPng()
{
    var src     = '';
    var ua      = '';
    var width   = '';
    var height  = '';
    var rpng    = new RegExp('\.png$');
    var rmsie   = new RegExp('msie');
    var rmac    = new RegExp('mac');

    for (var i = 0; i < document.getElementsByTagName('IMG').length; i++)
    {
        src     = document.getElementsByTagName('IMG')[i].getAttribute('src').toLowerCase();
        ua      = navigator.userAgent.toLowerCase();
        width   = document.getElementsByTagName('IMG')[i].getAttribute('width');
        height  = document.getElementsByTagName('IMG')[i].getAttribute('height');

        if (src.match(rpng) && ua.match(rmsie) && !ua.match(rmac))
        {
            document.getElementsByTagName('IMG')[i].setAttribute('src', 'images/spacer.png');
            document.getElementsByTagName('IMG')[i].style.filter = 'progid:DXImageTransform.Microsoft.AlphaImageLoader(src=\'' + src + '\', sizingMethod=scale)';
            document.getElementsByTagName('IMG')[i].style.width = width + 'px';
            document.getElementsByTagName('IMG')[i].style.height = height + 'px';
        }
    }
}

addEvent(window, 'load', fixAlphaPng);