Cannot GET image from HTTP request

[JohnS]

I already check image and they exactly exist in server
I have include image in css rule with this code\[code\].Invite{background: url("../images/interface/Shop/Btn_Ad_Invite_all.png") 0px 0px;}.Invite:hover{ background-position-x: -86px; }.Invite:active{ background-position-x: -172px; }<div class="Button Invite" onclick="invite()"></div>\[/code\]and try to use Jqeury ajax get and try to inject image to body with this code in browser console\[code\]$.get("https://fb.spot-the-differences.com/test/images/interface/Shop/Btn_Ad_Invite_all.png");$.get("images/interface/Shop/Btn_Ad_Invite_all.png");$("body").append("<img src='https://fb.spot-the-differences.com/test/images/interface/Shop/Btn_Ad_Invite_all.png'/>");$("body").append("<img src='http://stackoverflow.com/questions/13814092/images/interface/Shop/Btn_Ad_Invite_all.png'/>");\[/code\]all my browser (IE, Firefox, Chrome) says fail to get image with no response
And other computer in my local network can get image without problem
and if I copy image url and paste in to browser address I can receive image without problem

Can someone please explain to why this happen and how to solve this problem I don't want this to happen to client on my site.I would appreciate any kind of conversation or help.