jquery.effects.core.js, jquery.effects.blind.js and jquery.datepick.js are conflicting

jquery.effects.core.js, jquery.effects.blind.js and jquery.datepick.js are conflicting

I am using Keith's superbly easy to use Date Picker but if I add the files jquery.effects.core.js and jquery.effects.blind.js to my web page then the data picker stops working.

I am not able to sort out this problem any idea as to what must be conflicting here?