function doLazy(arrImage){
    var port_atas = $(window).scrollTop(), port_bawah = port_atas + $(window).height();
    for (var i = 0; i < loop; i++){
	if (port_atas <= imageFolds[i] && port_bawah >= imageFolds[i] && $(arrImage[i]).hasClass("noimg")){
	    $(arrImage[i]).attr("src", $(arrImage[i]).attr("longdesc")).removeAttr("longdesc").removeClass("noimg");
	    stillLazy -= 1;
	}
    }
}
function lazyload(){
    arrImage = $("img.noimg"), loop = arrImage.length, imageFolds = [], stillLazy = loop;
    for (var i = 0; i < loop; i++){
	imageFolds.push($(arrImage[i]).offset().top);
    }
    doLazy(arrImage);
    window.onscroll = function(){
	if (stillLazy >= 1){
	    doLazy(arrImage);
	}
    }
}