OpenTV

( OPTV) was gaining in the premarket after entering an agreement with

Matsushita Electric

(MC) - Get Report

to develop an interactive cable platform for Japan.

The Mountain View, Calif., interactive-television company said Matsushita will use its Device Mosaic HTML to develop an enhanced on-demand interactive system using the Japanese broadcast mark-up language, BML.

OpenTV was recently gaining $1.70, or about 23%, to $9.17 on Instinet.