var c;
$(document).ready(function(){
	var children=$("#six_blocs").find('div.bloc');
	c=children.length;
	var rnd1=0;var rnd2=0;var rnd3=0;
	var rnd1=rdn();
	do{rnd2=rdn();}while(rnd2==rnd1);
	do{rnd3=rdn();}while(rnd3==rnd2 || rnd3==rnd1);
	$.each(children,function(i){
		if(i==rnd1 || i==rnd2 || i==rnd3) $(this).show();
		else $(this).hide();
	});
});
function rdn(){return Math.floor(Math.random()*(c-1));}