function changeColor(index, old_index) {
	if(index >= color.lenght) { 
		new_c = 0; 
	} else {
		new_c = index;
	}
	
	if(old_index >= color.length) { 
		old = 0; 
	} else { 
		old = old_index; 
	}
	
	NLBfadeBg('col2', color[old], color[new_c],'1000');
}