function setup_menu(section)
{
	if(section == 'dirt_wise') {
		$('#tab_three').removeClass('tab_three');
		$('#tab_three').addClass('tab_three_active');
	} else if(section == 'products') {
		$('#tab_two').removeClass('tab_two');
		$('#tab_two').addClass('tab_two_active');
	} else if(section == 'about') {
		$('#tab_one').removeClass('tab_one');
		$('#tab_one').addClass('tab_one_active');
	}
}

function clear_default(element, default_value)
{
	if (element.value == default_value) 
	{
		element.value = '' ;
	}
}