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큰이미지를 사용한 이유도있겠지만

소스에도 속도를 더디게 하는 문제가 있는 것 같아요

고수님들이 도움이 간절히 필요합니다

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var main_backimg_list = ["main2","main1"];
var special_backimg = {list : ['pool','refting','babeq','hiking','fishing','sled','song','semina','laundry','rest','safety'], pos : 0, intval:'' }

function changeBackimg(imgkey, idkey, complete) {
if (typeof(idkey) == "undefined") var idkey="special_box";
switch(idkey) {
case "special_box":
imgkey = "p_"+imgkey;
}
var node= $("<img></img>").attr("src", "../images/s/"+imgkey+".jpg").css("display","none")
.appendTo("div#"+idkey).fadeIn(1000, function() {
$("img#"+idkey+"_img").remove();
$(this).attr("id", idkey+"_img");
if (typeof(complete) != "undefined") eval(complete);
});
}

function changeBackimgLoop(i) {
if (typeof(i) == "undefined") var i=0;

var img = $('img#visual_box_img');
if (img.width() == 0) img_width = 2000;
else img_width = img.width();
var toLeft = $('body').width()-img_width;//img.width();
if (toLeft>0) toLeft = -toLeft;
img.css({"top":"0px", "left":"0px"}).stop(true,true)
.animate({"left":toLeft+"px"},
{duration: 12000, queue: false, complete: function() {
img.stop(true,true);

if (i+1==main_backimg_list.length) key=0;
else key = i+1;
changeBackimg(main_backimg_list[key], 'visual_box', 'changeBackimgLoop('+key+');');

}
});
}

function changeBackimgSpecial(i, control_int_val) {
if (typeof(i) == "undefined") var i=0;
if (control_int_val != "nonstop") {
clearInterval(special_backimg.intval);
changeBackimgSpecialLoop();
}

$("#thumnail_box").find(".active").removeClass("active");
$("#"+special_backimg.list[i]).find("a").addClass("active");
changeBackimg(special_backimg.list[i], 'special_box', '');//'changeBackimgSpecial('+key+');'
special_backimg.pos = i;
}

function changeBackimgSpecialLoop() {
special_backimg.intval = setInterval(function(){
if (special_backimg.pos+1==special_backimg.list.length) key=0;
else key = special_backimg.pos+1;
changeBackimgSpecial(key,'nonstop');
}, 3500);
}