Hello I am using Firefox and I get this message, I have went to options/content and ticked the box for enable javascript

Sadly, the iSketch website tries to load scripts from a lot of different sources (google, google analytics, gstatic, google friendconnect, flattr, project wonderful... you get the idea).
It is possible that one or more of these scripts are required to run successfully in order to execute the part of javascript that inserts the shockwave object into the page. If you are using adblock, noscript or a similar addon that blocks script or other content, these might just block one of those required scripts.

try disabling such addons and see if isketch loads.

does isketch load in other browsers?

thanks for reply, I managed to get it to load in IE when I clicked the box to allow content, I don't use any adblock other than the firefox default (?)