JackR - 10:15 pm on Nov 3, 2011 (gmt 0)

Here's the css part:

.popBox{background-color:#000;border:1px solid #92217d;} .popBox, .dialogBox{display:none;position:fixed;z-index:990000;overflow:auto;top:100px;left:50%;width:760px;height:500px;margin-left:-400px;padding:20px;background-position:0 0;color:#fff;text-align:center;border:1px solid #fff;} .popBox_close{position:absolute;top:5px;right:5px;width:80px;height:10px;z-index:20001;display:block;background:url(http://cdn1.example.co.uk/interface/popClose.gif) top left no-repeat;}

[edited by: eelixduppy at 12:56 am (utc) on Nov 4, 2011]
[edit reason] exemplified [/edit]