Joomla conflict between two extensions

Joomla conflict between two extensions

i have a problem since i've installed a second extension on my joomla(2.5)
website. The console log shows "TypeError: $(...).addEvent is not a
function" linked to the extension "adminForm" :
$('adminForm_'+pf).addEvent('submit', function(e) {...}
Both extensions seems to be using addEvent() so it creates the conflict...
When i disable one of the two extension it works fine but i have to use
them both.
Is there a way to make them work together without any conflict?
Thank you