function show_iframe(id){
    if(id==1){
	        html='<iframe title="YouTube video player" width="480" height="390" src="http://www.youtube.com/embed/-I3EGCqJvUQ?rel=0" frameborder="0" allowfullscreen></iframe>';
	    }
	    if(id==2){
	        html='<iframe title="YouTube video player" width="480" height="390" src="http://www.youtube.com/embed/o363qlmtZX4" frameborder="0" allowfullscreen></iframe>';
	    }
	    if(id==3){
	        html='<iframe title="YouTube video player" width="480" height="390" src="http://www.youtube.com/embed/aEwZJ0cou5I?rel=0" frameborder="0" allowfullscreen></iframe>';
	    }

	 
	    document.write(html);
}