/**
 * jQuery plugin: Lazy Image Loader
 * version: 3.0
 * Author: Vivek Pohre,Shon Thomas
 * Website: (http://www.vivekpohre.com)
 * Example: call lzload() at or after document ready
 */

function lzload(){
    var w=window,adv=30,vph,tmpLD,nowView,collImg,imgTop,scrTop,ci;
    function getVPH(){
	    //DETERMINE WINDOW VIEWPORT HEIGHT ALWAYS TO AVOID RESIZING BROWSER ERROR
	    if(typeof (vph = w.innerHeight?w.innerHeight:$(w).innerHeight()) != "Number")
	        vph = document.documentElement.clientHeight;
    };

    //SAVE THE Y AXIS IN TOP ATTRIB
    getVPH();//GET THE VIEWPORT HEIGHT
    imgTop = 0;//INIT IMGTOP TO ZERO--TEMP VAR
    collImg = $("#content img").filter(':[longdesc]');//COLLECT ALL IMAGES HAVING longdesc ATTR
    collImg.each(function(){
    	imgTop = $(this).offset().top;
    	$(this).attr("top",imgTop);
    });
    $(w).bind("scroll",function(){loadImgs()}).bind("resize",function(){getVPH();loadImgs()});//ATTACH SCROLL & RESIZE EVENT TO WINDOW
    $.loadImgs = loadImgs = function(imgSet){//MAKE loadImgs FUNCTION PUBLIC
    	ci=(imgSet)?imgSet.show():collImg;//DECIDE COLLECTION FROM PASSED OR ALL DOM IMAGES
        scrTop = $(w).scrollTop();
        //DETERMINE THE Y-AXIS IN THE VIEWABLE AREA
        nowView = (scrTop+vph+adv);
        ci.filter(':[longdesc]').filter(':visible').each(function(i){
            if($(this).attr("top")<nowView){
            tmpLD = $(this).attr("longdesc");
            if(typeof tmpLD!='undefined')
               $(this).attr("src",tmpLD)[0].removeAttribute("longdesc",0);
            }
        });
        ci=collImg;
    };
    loadImgs();
    $("#content img").error(function(){
		$(this).attr("src","http://o.aolcdn.com/shopping.aol.com/img/notavailable.gif");
	});
}