/*--------------------------------------------------------------------------*
 *
 *  alphafilter JavaScript Library beta3
 *
 *  MIT-style license.
 *
 *  2007 Kazuma Nishihata
 *  http://www.webcreativepark.net
 *
 *--------------------------------------------------------------------------*/

new function(){

    if(window.addEventListener){
        window.addEventListener('load',alphafilter,false);
    }else if(window.attachEvent){
        if(!window.attachEvent) return;
        window.attachEvent('onload',alphafilter);
    }

    var IE = navigator.appName.indexOf("Microsoft Internet Explorer",0) != -1;
    var tSheet;
    if (IE) {//for old ie
        //if ( navigator.appVersion.indexOf("MSIE 6",0) != -1 ) {
            var sheets=document.styleSheets;
            tSheet = sheets[sheets.length-1];
            tSheet.addRule('.alphafilter',"{visibility:hidden;}");
        //}
    }

    function alphafilter(){
        if (typeof document.body.style.maxHeight == "undefined") {//for old ie
            var elements = getElementsByClassName("alphafilter");
            for (var i=0; i<elements.length; i++) {
                var element = elements[i];
                if(element.nodeName=="IMG"){
                    var newimg           = document.createElement("b");
                    newimg.id            = element.id;
                    newimg.className     = element.className;
                    newimg.style.display = "block";
                    newimg.style.width   = element.width;
                    newimg.style.height  = element.height;
                    newimg.style.styleFloat = element.align;
                    newimg.style.filter  = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src="+element.src+",sizingMethod='scale')";
                    element.parentNode.replaceChild(newimg,element);
                }else{
                    var anchors = element.getElementsByTagName("a");
                    for (var j=0; j<anchors.length; j++) {
                        var anchor = anchors[j];
                        anchor.style.position="relative";
                    }
                    var  newimg = element.currentStyle.backgroundImage || element.style.backgroundImage;
                    newimg.match(/^url[("']+(.*\.png)[)"']+$/i)
                    var newimg = RegExp.$1;
                    element.style.filter ="progid:DXImageTransform.Microsoft.AlphaImageLoader(src="+newimg+",sizingMethod='image')";
                    element.style.background = "none";
                }
            }
        }
        if ( IE ) {
            tSheet.removeRule(tSheet.rules.length-1);
        }
    }

    function getElementsByClassName(className){
        var i, j, eltClass;
        var objAll = document.getElementsByTagName ? document.getElementsByTagName("*") : document.all;
        var objCN = new Array();
        for (i = 0; i < objAll.length; i++) {
            eltClass = objAll[i].className.split(/\s+/);
            for (j = 0; j < eltClass.length; j++) {
                if (eltClass[j] == className) {
                    objCN.push(objAll[i]);
                    break;
                }
            }
        }
        return objCN;
    }
}