jquery.scrollTo active anchor link on scroll

Here is my current code. Again I am trying to find out how to set "active state" on the anchor link while scrolling.

$('ul#submenu-page li a').click(function(e) {		
		e.preventDefault();
		
		var subMenuId = $(this).attr("href");				
		$('ul#submenu-page li').removeClass("active");
		$(this).parent("li").addClass("active");
		
		if (subMenuId==='#section1') {
			$('body, html').scrollTo(0, 1000, {easing:"easeInOutExpo"});			
		} else {		
			$('body, html').scrollTo("#page " + subMenuId, 1000, {easing: "easeInOutExpo", offset:{top:-180}});
		}
	});

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Try this:

$('ul#submenu-page li a').click(function(e) {		
		e.preventDefault();
		
		var subMenuId = $(this).attr("href");				
		$('ul#submenu-page li').removeClass("active");
		$(this).parent("li").addClass("active");
		
		if (subMenuId==='#section1') {
			$('body, html').scrollTo(0, 1000, {easing:"easeInOutExpo"});			
		} else {		
			$('body, html').scrollTo("#page " + subMenuId, 1000, {easing: "easeInOutExpo", offset:{top:-180}});
			$("#page " + subMenuId).addClass("active");

		}
	});

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skij thank you but....

This is on click function. I talking about the scroll. So when the user scrolls the page and enter e.g. section2 then in the menu with the class "section2" will set to active. Do you know what i mean?

Try this:
http://jsfiddle.net/cse_tushar/Dxtyu/141/

skij :-) I actually bookmarked this page while I was searching for the solution.
Yet my current code works so nicely so I do not want to refine everything.
If you will tell me that that's the easy way to go then I will have no choice but to delete my codes and take this one.

skij you are one of the brilliants :-)  Thank you so much this was very helpful.