Get Equal Width for element base on parent element

equalWidth.js

	var total = 0;
	$('.ClassName').each(function() {
		total+= $(this).width();
		total+= parseInt($(this).css('margin-left'), 0);
		total+= parseInt($(this).css('margin-right'), 0);    
		total+= 0;
	});

	var num_blocks = $('.ClassName').size();

	// now calculate the extra space left
	var extra_space = (parseInt($('.ParentClassName').width())-total)/num_blocks;

	$('.tt_tabs li').each(function() {
		$(this).width($(this).width()+Math.floor(extra_space));  
	});