var name = "#floatMenu";
    var menuYloc = null;
    $(document).ready(function(){
        menuYloc = parseInt($(name).css("top").substring(0,$(name).css("top").indexOf("px")))
        $(window).scroll(function () { 
            var offset;
			if ($(document).scrollTop() < 350) offset = "350px";
			else offset = menuYloc+$(document).scrollTop()-350+"px"; 
            $(name).animate({top:offset},{duration:500,queue:false});
        });
    });