Nice games!
why King's gambit is a bad idea

Thanks. ofcourse there were bluders from both sides but movement of king is forced for white and the game is fun

man, just don't take that bishop on h4!! you are exchanging your good attacking knight for what? black wastes two tempi to put his bishop on a really bad square and he will have to move it again. true, black is declining you the 0-0, but you have to play Kf1 anyway after Qxh4+.
try it like this:
with a LOT of threats along the f-file.. look up some of Morphy's games, or put the notation into google and study.
Just, please, don't ever capture that bishop again!!

I played black though in both the games but you variation is completely lost for white. taking bishop is a bad idea. g3 is even worse. The right continuation is to move the king. again black is better here

No, the line given by senor_ananas is a well known continuation that gives white an enormous lead in development and should most likely be avoided by black.
If black was just better here then you succeeded in finding a bust to the KG that eluded even Bobby Fischer.

Is it really? How do you propose black tries to attack?
Be careful though, because blacks king might be in more danger than whites.
Do you want to play me a live game in this line? I'll show you how it should progress.

ask Paul Morphy which king is in more danger :) white king looks exposed, but black has really no easy way to exploit that. I am not talking about players like 2200 FIDE, but players at our level. black has simply no time to do that. one example: http://www.chessgames.com/perl/chessgame?gid=1027921
I am sure you would find many others, starting here: http://www.chessgames.com/perl/chess.pl?pid=16002&playercomp=white&opening=C33-C39&title=Paul%20Morphy%20playing%20the%20King%27s%20Gambit%20Accepted%20as%20White
Be7 followed by Bh4 check is a very bad idea. Something like this may happen:
The king's gambit is not bad at all. The main reason it is not seen much in professional play these days is white has trouble proving an advantage if black knows what he is doing in that opening and these days GM's look for openings that have a good chance of an advantage. In amateur play the Kings Gambit is still a good opening to try for an advantage and can provide aggressive and tactically strong players positions that suit them well. I used to play it often but gave it up for a similar but less seen gambit called the Vienna Gambit. Note however that any gambit if not handled correctly is a bad idea as the nature of gambits is usually a higher risk/reward opening. That doesn't make the opening itself bad though. Your variation/line is not dangerous for white if white knows how to handle it properly. It seems your opponents didn't.

You are right, the Kings Gambit really isnt very dangerous for black. You can easily get good play with the main line(g5) or with the counter-gambit( e4 e5, F4 Nc6, Nf3 f5). Both lines are at least OK for black. But your line is not only very bad but its also a line which gives white a reason to play the kings-gambit. Funny, if this is a serious thread...
Here are some of my games to show king's gambit is not a good idea after all :)