(function($) {

	$.fn.main_menu = function(){

		var thisID = $(this).attr("id");
		var bodyID = $("body").attr("id");

		//alert(bodyID);

		switch ( bodyID ) {
			
			case "proactive-services":
			$("#main_nav li:eq(0) a").addClass("on");
			break;

			case "networking-telephony":
			$("#main_nav li:eq(1) a").addClass("on");
			break;		

			case "business-continuity":
			$("#main_nav li:eq(2) a").addClass("on");
			break;	

			case "dc_experience":
			$("#main_nav li:eq(3) a").addClass("on");
			break;
		}

	}

})(jQuery);