// JavaScript Document

var check_sections_counter = 0;

function section_selected(i)
{
	if (i.checked == true && check_sections_counter <= 3) {
		check_sections_counter++;		
	} 
	
	if (i.checked == false) {
		check_sections_counter--;
	}
	
	if (check_sections_counter > 3) {
		$('sections_note').setStyle({'backgroundColor':'#c00', 'color':'#ffffff'});		
		i.checked = false;
		check_sections_counter--;		
	}
}