Can't get Limewire 5 to open

[JaredMN76]

I had been using version 4.? and proceeded to dl 5. I am running MAC OS 10.5.6. Limewire 5 won't open and it tells me I need a new version of Java or something :

"this application require a 1.6+ version of Java." is the message I get...but when I searched for that I found nothing. Also, my old version of Limewire seems to be gone now.

Any help is appreciated.

Thanks,

Jared