Charging battery interfereing with trackpad!

Today I purchased a new charger for my macbook pro and it all seemed to be working great.
a few hours later my trackpad has been playing up. the 'pointer/mouse' wont go in a straight line it's all jaggered and its slow and drags, basically wherever my finger moves on the trackpad the mouse clicker is hardly in sync it also has difficult moving to the right as if there's an invisible wall in the way.
I unplugged the charger and my trackpad returned to normal.
plugged it back in and it went back to impossible.
it seems like the charger is interfereing with the trackpad :/
which is so annoying becuase I need it to remain constantly on the charger.
I need a new laptop battery in general and will be getting one soon, i doubt that has anything to do with it as it reverts back to normal when the charger is taken away. i tried re-starting etc also but nothing helped.
why is this happening and what should I do? i can't even click on something because the mouse is too slow to repond or wont allow smooth movement enough to even get it right on the link yet I need to keep it charged -_-
does anyone have a possible solution for me or answer as to why this is even possible? any info would be great

thanks for the reply,
Indeed, the trackpad goes back to normal when the charger is removed. although I have been using this new charger for a few hours this issue with the trackpad has only just started happening. I bought the charger online as I needed it urgently and it worked out that it would arrive sooner than I could get in store.
this is the charger I bought: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=170897190817
I've contacted the seller with my issue to see what they say.
I do need to go in store as, as mentioned, I need to get a battery replacement but I can't do that just yet as I need my computer over this week urgently and they informed me they couldnt replace it in one day.
so very annoying I'm having so many issues with the laptop all at once >.<
this trackpad this is definitely an inconvenience though -_-

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