document.write('<!--[if lte IE 6]><style type="text/css">.hack-png{visibility:hidden}</style><![endif]-->');
var PNGHack = function(spacer) {
        var remoteUrl = 'http://pnghack.googlepages.com/spacer.gif';
        var hackMethod = function(obj, method, that) {
                // browser check
                if (that.checkIE && !navigator.userAgent.match(that.checkIE))
                        return;
                
                // settings
                if (!obj) obj = {};
                var d   = obj.scope || document;
                var elm = (!obj.elm && method != 2) ? d.all : d.getElementsByTagName(obj.elm);
                var src = obj.src || 'src';
                var ext = new RegExp((obj.ext) ? '\\w+.'+obj.ext.toUpperCase() : '\.PNG$');
                
                // hack core
                var hack = function(elm, source) {
                        var style = elm.style;
                        if (!elm.pngsrc)
                                that.elements.push(elm);
                        elm.pngsrc = elm.getAttribute(source);
                        style.width = elm.clientWidth;
                        style.height = elm.clientHeight;
                        style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+elm.pngsrc+"',sizingMethod='scale')";
                        
                        // using hosted spacer, set it up to rescue local spacer or cancel remotehost
                        if (that.remotehost == true)
                                spacer = remoteUrl;
                        else if (that.remotehost != false) {
                                var rescueSpacer = function() {
                                        elm.setAttribute(source, remoteUrl);
                                };
                                var setRescueSpacer = function() {
                                        if (elm.readyState == 'complete') {
                                                elm.detachEvent('onerror', rescueSpacer);
                                                elm.detachEvent('onreadystatechange', setRescueSpacer);
                                        }
                                };
                                elm.attachEvent('onerror', rescueSpacer);
                                elm.attachEvent('onreadystatechange', setRescueSpacer);
                        }
                        
                        // displaying element / removing hack-png class
                        elm.setAttribute(source, spacer || 'images/spacer.gif');
                        if (elm.className.match(/\bhack-png\b/))
                                var x = setTimeout(function(){elm.className = elm.className.replace(/hack-png/g,'');clearTimeout(x);},300);
                };
                
                // hack method
                if (method == 2) {
                        hack(obj.elm, src);
                        return;
                }
                
                // go and crush method
                for (var i = 0; i < elm.length; ++i) {
                        var isrc = elm[i].getAttribute(src) || '';
                        if (method == 0 && elm[i].className.match(/\bhack-png\b/)
                        || (method == 1 && isrc.toUpperCase().match(ext)))
                                hack(elm[i], src);
                }
        };
        return {
                hackClass : function(obj) {
                        hackMethod(obj, 0, this);
                },
                hackExtension : function(obj) {
                        hackMethod(obj, 1, this);
                },
                hackElement : function(obj) {
                        hackMethod(obj, 2, this);
                },
                elements : [],
                checkIE : 'MSIE 5\.5|MSIE 6',
                remotehost : null
        };
};