Adobe has confirmed it is still working on bringing Flash to the iPhone.

Speaking to Bloomberg, the news service, at the World Economic Forum in Davos, Switzerland, Adobe CEO Shantanu Narayen acknowledged the plan to add Flash technology to the iPhone was proving a challenge.

“It’s a hard technical challenge, and that’s part of the reason Apple and Adobe are collaborating,” Narayen told Bloomberg. “The ball is in our court. The onus is on us to deliver.”

No timescale was mentioned indicating when Flash would appear on the iPhone. Flash would allow online video and animation to run smoothly on Apple’s smartphone.

Flash, along with Java is not supported by the iPhone, yet Flash Lite does run on the Symbian OS, and Android version is promised.

Steve Jobs, Apple’s CEO, currently taking a leave of absence from the iPhone maker, had previously said Flash Lite wasn’t fast enough for the iPhone requesting Adobe go back to the drawing board.

In November, Adobe explained plans to broaden the use of Flash on mobile phones. "We are in the midst of evolving Flash Player 10 for mobile," Chief Technology Officer Kevin Lynch said. "We're taking the full Flash Player and making that run on the higher end of the mobile market," although no mention was made of the Apple iPhone at the time.

Enabling Flash and Java to run on the Apple iPhone would expand the volume of applications that could run on the smartphone.

More widely technology will help the global economy pull out of the recession, Adobe CEO Shantanu Narayen told Bloomberg last week.

“In the short run, there’s limited visibility in technology spending,” he said. “But when we look at the macro spending, we think tech spend will be one of the ways we get out of this funk.”