My Laptop Seems to Be Heating up Rapidly....

ok, So my inspiron 1420 is heating up very rapidly. what do i do? it feels like a heater. and actually starts to burn if i touch it for too long.... so what goes on here?? my laptop is still under warranty but as with the same problem before, I have class all day usually from 8am to 6pm and then work. so how do i get it fixed?? i need my laptop for class so sending it to dell and waiting 3 -4 weeks is not an option. what are my other options???