‘send to editor’ function for images doesnt work

I have been having this problem for a while. Image upload works fine no problem but when i try to ‘send to editor’ nothing happens.

This is what i get in firefox java console:

Error: richedit is not defined
Source File: https://wag.myzen.co.uk/thepolytechnic/wp-admin/inline-uploading.php?action=view&post=-1157096403&all=true
Line: 188

Error: syntax error
Source File: javascript:void()
Line: 1, Column: 5
Source Code:
void()

Please help ..

Many Thanks,

f