B757 CREW HAD AN ELECTRICAL BURNING RUBBER SMELL IN THE CABIN.

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ELECTRICAL SMOKE/FUMES IN CABIN. WE WERE DIRECTLY OVER ELP WHEN THE #1 FLT ATTENDANT CALLED AND TOLD US THAT THERE WAS A STRONG SMELL OF SOMETHING BURNING IN THE MIDDLE OF THE CABIN. I DONNED MY OXYGEN MASK AND SENT THE FO BACK TO CHK. HE RETURNED AND SAID THAT THE ODOR WAS QUITE STRONG AND SMELLED LIKE AN ELECTRICAL FIRE AND BURNING RUBBER. HE RECOMMENDED THAT WE LAND. I DECLARED AN EMER AND REQUESTED AN IMMEDIATE TURN FOR ELP; MADE A PA TO THE PAX AND CALLED ELP OPS AND REQUESTED THAT THEY INFORM DISPATCH. I COMPLETED THE CABIN FIRE/SMOKE CHKLIST AND ALL OTHER NORMAL CHKLISTS WHILE FO DSNDED FOR THE LNDG AT ELP. THE #1 FLT ATTENDANT TOLD ME DURING THE DSCNT THAT THE SMELL SEEMED TO DECREASE SOME. A NORMAL LNDG WAS MADE AT ELP. A SUBSEQUENT CHK BY MAINT COULD FIND NOTHING DEFINITE BUT WE ALL GUESSED THAT IT WAS MOST LIKELY THE ENTERTAINMENT SYS. THE ENTERTAINMENT SYS WAS DE-ENERGIZED AND WE WERE DISPATCHED TO CONTINUE TO DFW. A GREAT JOB WAS DONE BY THE FLT ATTENDANTS IN KEEPING US INFORMED AND ALSO A GREAT JOB BY FO. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE CAPT SENT THE FO TO INVESTIGATE THE ODOR. HE WAS UNABLE TO LOCATE THE SOURCE. HE RPTED THAT IT SMELLED LIKE ELECTRICAL WIRING; COMBINED WITH BURNING RUBBER. AFTER LNDG; MAINT INVESTIGATED ALL OVERHEAD TV SYS AS WELL AS ALL OTHER CABIN ELECTRICAL ITEMS. NOTHING WAS FOUND. THE ENTERTAINMENT SYS WAS MEL'ED INOP AND THE FLT CONTINUED TO ITS DEST. AFTER LEAVING THE ACFT; THE CREW DOES NOT KNOW WHAT HAPPENED TO THE ACFT.