Colorbox cannot load the image added by js

As we know, Colorbox is a wonderful js plugin. I came up against a head-banged problem in v1.5.6. When I add some images to the group, Colorbox cannot bind them. A foreign forum give me some hints, so I post them to share with you. You should place them after the js code you add image.

$('#id').colorbox({
　　inline:true,
    href:'#id',
    opacity:0.5,
    overlayClose:true,
    rel:"the group name"
});
What I want to emphasize is #id, it is unique mark for image's parent target a.