$(document).ready(function() {

	function fixPadding() {
		var menu_items_total_width = 0;
		var nrMenus = 0;
		
		$("div#main_menu ul li a").each(
			function(i) {
				nrMenus += 1;
				menu_items_total_width += $(this).width();
			}
		);
		
		var avaiable_width_for_padding = 980 - 2*25 - menu_items_total_width;	// menu_container - left & right menu ul padding
		
		var padding = Math.floor( avaiable_width_for_padding / ( nrMenus - 1 ) );
		
		$("div#main_menu ul li:not(.last) a").css( 'padding-right', padding );
	}
	fixPadding();
});