The fun-loving teenager, described as "the perfect daughter" by her parents, went on a bike ride on 18 May last year. Her body was found in woods near her home in Branton, near Doncaster, four days later. Her family was devastated to discover that Carina, who was looking forward to starting A-levels, had been leading a double life online.

"This was the hardest part.

Going online was just like getting to know a completely different child, " said her mother.

It may be illegal to groom children for sex online, but grooming them for death is a different matter. Carina is one of many young people whose deaths have been linked to suicide websites, most recently the suicide of a 13-year-old girl a few weeks ago.

Parents of the victims are calling for a ban on sites that promote suicide.

Carina's mother feels no anger towards the girls her daughter made a pact with. "I think they were shocked that Carina had actually done it.

But the people behind the sites should be locked up. I class it as assisted suicide. It is horrific and the pain of losing her will never ever go. We need to stop these sick maniacs. I want all these sites shut down."

The campaign is being led by Papyrus, a charity set up by parents of victims. Today, World Suicide Prevention Day, Papyrus is launching a Safety on the Internet guide available from www. papyrus-uk. org. uk.

The Samaritans cite the danger of suicidal people bonding online and is working with internet companies to encourage self-regulation. Spokesperson Sarah Nelson said, "Most of these sites are hosted in other countries and it would be very difficult to police."

One pro-suicide website states, "As with many things, the best results are achieved by thorough research and careful preparation." A web administrator on another website says of their critics, "they think death is an inherently bad thing, while I don't."