Headlight problem 95 GTs

The headlights on my mustang GTs, after it gets hot inside the engine compartment, will start to flash on and off, its only the headlights and none of the other lights. It makes the car almost impossible to drive at night when this happens. Someone stoped to help me out last night and said it is a headlight relay that went bad, but I cant seem to find any info on headlight relays on the web or for that matter any problem similar to this one. Im kind of desperate for the help cause were getting ready to move and were going to need to drive the car at night. we really hadnt noticed the problem before but thats probably cause Ive only had the car for 4 months and havent had to drive at night much.

Thanks for the help,
Vip3r

Thanks very much mark, ill try to do that tomorrow. BTw how difficult is it? anyone have directions on how to do something like that?

ok im working on this, but how do I get this head light knob off, I did a google search and it found an old post thats been deleted, that had directions but its gone now any help would be awesome.

Thanks,
Vip3r

Edit: I got it off, thanks, need to find a harness connector ours is melted, so thats looks like it was the problem

thats almost exactly what I did, thanks very much. The headlights seem to be working with the new switch, with out a problem so far.