video reverse splitting

[BOBO1980]

or something like that

i am trying to hook up two separate video outputs which have been split into one tv.

i need to display two different outputs from separate sources onto one tv at the same time. is there any way to do this. please i need to know how to do this .

so i am having 3 tv's total. one for each output, then one for both. i am not even sure if this is possible but i have to try

thanks

beau