The fact that the murders occurred many years ago has no relevance to the families or friends of these young girls

Detective Inspector Paul Bethell

Their killer has never been found, but a DNA screening programme was launched last year after samples were obtained from one of the girls.

The BBC TV programme Crimewatch UK also gave the investigation a major boost, showing a reconstruction of the events leading up to the girls' deaths.

Police now hope the website information will give fresh impetus to their inquiries.

Detective Inspector Paul Bethell, who is leading the investigation, said he saw the internet as "an important comunication tool" which gave the force the ability to carry out inquiries worldwide.

And he said he hoped the murders would be solved once and for all.

Geraldine Hughes's killer may yet be tracked down

"I can only describe this most appalling of crimes as every parent's worst nightmare," he said.

"The fact that the murders occurred many years ago has no relevance to the families or friends of these young girls.

"The healing process cannot take place whilst the killer remains free."

Detectives received hundreds of calls following the Crimewatch UK reconstruction in January.

Pauline Floyd and her friend had been strangled

The programme retraced the last steps of the Neath teenagers, murdered on their way home from a nightclub in Swansea in 1973.

The crime has never been solved but detectives have taken more than 200 calls following the programme - some giving names and other potentially vital information.

The girls had been raped and strangled.

The police investigation was given a kick-start last autumn when new technology allowed a DNA profile to be built up from material found on Pauline's clothing.

Officers believe there are still people who hold useful information and they are hopeful that the reconstruction will have jogged memories.

Forensic techniques

Detectives are tracking down dozens of possible suspects from the murder files - some of whom who have moved as far away as Australia.

South Wales Police said in September last year that they planned to re-open the case because of the availability of new forensic techniques.

They announced "exciting" advances in profiling techniques.

Detectives questioned 30,000 people, including 10,000 motorists, in connection with the double murders.

The girls were thought to have hitched a ride home from the Top Rank club in Swansea.

They are thought to have travelled in a light coloured car, which has never been traced.

For more information on the Llandarcy murder investigation, see the South Wales Police website

http://www.south-wales.police.uk/llandarcy/