function getBanner(){
	var total_weight = 0;
	var i = 0;
	
	for ( var i = 0; i < arBanner.length; i++ )
		if ( i != inLastBanner ) total_weight += arBanner[i][3];
	
	inRand = get_random(total_weight);
	
	i = -1 ;
	while ( inRand >= 0 ){
		i += 1;			
		if ( i != inLastBanner ) inRand -= arBanner[i][3];
	}
	
	return i;			
};

function get_random( inTop ) {
	var ranNum= Math.floor(Math.random() * inTop );
	return ranNum;
};

shuffle = function(o){ //v1.0
	for(var j, x, i = o.length; i; j = parseInt(Math.random() * i), x = o[--i], o[i] = o[j], o[j] = x);
	return o;
};