var name = "#sc_menu";
var menuYloc = null;
$(document).ready(function(){
	menuYloc = parseInt($(name).css("top").substring(0,$(name).css("top").indexOf("px")));
	$(window).scroll(function () {
	  if(menuYloc+$(document).scrollTop()>308){
	    spanNum=308;
      offset = (menuYloc+$(document).scrollTop()-spanNum)+"px";
  		$(name).animate({top:offset},{duration:500,queue:false});
	  }else{
	    spanNum=0;
      offset = spanNum+"px";
  		$(name).animate({top:offset},{duration:500,queue:false});
	  }
	});
});