Top Of Plants Stem Gone Thin And Plants Drooped Over (about 5-7 days old)

The leaves seem pretty gigantic for it's size and they seem to be too much for my plant to hold? The stems gone thinner towards the top and it's toppled over - here's some pictures and what should I do? It's now under a 600w Sodium HID (MH hasn't arrived yet) and the temperature is around 80-90 degrees and i'm watering it everytime the soil feels dry surrounding the plant. But for it's previous life duration it's been under 2 1250 lumens fluorescents (2700k).

http://imageshack.us/photo/my-images/526/dscf0572q.jpg/

http://imageshack.us/photo/my-images/249/dscf0574j.jpg/

http://i39.tinypic.com/9s77rs.jpg

Get your lights closer, stake it up with a small stick and get a small fan to blow a real lite breeze on it to strengthen up the stem and you'll be gravy