(function($){  

$.fn.positionMainMenu = function(center){  
  
var element = this; 

positionMainMenu();  
  
$(window).bind("resize", function(){  
    positionMainMenu();  
});
 
function positionMainMenu(){ 
  
	// Checking Viewport Start -----------------------------------------
	
	var viewportwidth;
	var viewportheight;
 
	// the more standards compliant browsers (mozilla/netscape/opera/IE7) use window.innerWidth and window.innerHeight
 
	if (typeof window.innerWidth != 'undefined')
	{
      viewportwidth = window.innerWidth,
      viewportheight = window.innerHeight
	}
 
	// IE6 in standards compliant mode (i.e. with a valid doctype as the first line in the document)

	else if (typeof document.documentElement != 'undefined'
	&& typeof document.documentElement.clientWidth !=
	'undefined' && document.documentElement.clientWidth != 0)
	{
       viewportwidth = document.documentElement.clientWidth,
       viewportheight = document.documentElement.clientHeight
	}
 
	// older versions of IE
 
	else
	{
       viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
       viewportheight = document.getElementsByTagName('body')[0].clientHeight
	}
	
	// Checking Viewport End -------------------------------------------
	
	
	var promo_height = document.getElementById('main_nav_promo').offsetHeight;
	
	var menu_top = 207 // img: 197px + margin-top: 10px
	
	var menu_bottom = 46 // footer: 36px + spacing: 10px
	
	var newHeight = (viewportheight - promo_height - menu_top - menu_bottom);
	
	$(element).height(newHeight);
	
	// alert("Mainmenu: newHeight: " + newHeight + " viewportheight: " + viewportheight+ " promo_height: "  + promo_height + " menu_top: " + menu_top+ " menu_bottom: "  + menu_bottom);
	
	
	// document.write('<p>promo_height is '+promo_height+'</p>');
  
};
  
};  
  
})(jQuery); 

  	
// $(function(){  
//	 $("#main_menu").positionMainMenu(true);
// });