Javascript Popup window scales large images :(?

Hey all,

I have a javascript popup which opens a very long image (1274px) and it’s width is (580px). I need this to open at 100% in my popup window - yet when I open the popup it will always be scaled by 60% or 80% but how can i say display scrollbars and display at 100%??

It’s really annoying me and I have googled for it and nothing.
Any help ASAP would be great!!

Thanks in advance :smiley: