Wireless bridging of 2 routers

I have a Dlink DSL2640U adsl+router on my ground floor which is connected to internet.the signal on the 1st floor is usable but on the 2nd floor its very low and keeps disconnecting.I have a Dlink DIR 615 wireless router on the 2nd floor.

What i want is Dlink DSL2640U and DIR615 to be connected, so if i connect to DIR 615 on wireless i get the access to internet through Dlink DSL2640U.

Thank you
 
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