why can't FF load the script on this page?

Works fine for me. Go to Tools -> Add-ons -> Plugins and see if you have Java™ Platform. If it doesn't say SE 6, it might be that the applet requires Java 6 and you only have Java 5.

Are u sure it works? the "script" is suppose to be this graph where you can enter the equations and it calculates the area and stuff..

for plug in I have Java™ Platform SE 6 U11 (the latest one)

I have also asked one of my friend to try this website and it doesn't work for him too on FF.

This is what happens when I go to that site, the site acts like it's loading the script, or it seems it's loading the script, but it's finished, it's just blank with nothing inside.

edit: ok it works this time, I don't get how it won't work before... it takes a while to load.

this is my 4th time trying and it worked... in the other 3 times, it just finish everything but nothing shows up in the place where the script is...