Hey, I'm real far from being an expert, but I started some papaya seeds a little over two weeks ago, and I had a few of mine do o the same thing. I was using "Country Cottage Seed Starter" for soil (basically a whole lot of peat moss, vermiculite, and a touch of lime for Ph balance). Now I'm going to tell you what worked for me, but only because nobody is answering you, and its been 2 days -- I am only advising as a last resort b/c your plants look to be in dire straights! I used a mixture of about 1/10 urine and 9/10 water. My plants seemed to perk back up.

Now go lightly; my plants did fine, but I understand you can really F*#$ stuff up overdoing that urine!