$(document).ready(function(){
    $(".scroll").click(function(event){
        //prevent the default action for the click event
        event.preventDefault();
 
        //get the full url - like mysitecom/index.htm#home
        var full_url = this.href;
 
        //split the url by # and get the anchor target name - home in mysitecom/index.htm#home
        var parts = full_url.split("#");
        var trgt = parts[1];
 
        //get the top offset of the target anchor
        var target_offset = $("#"+trgt).offset();
        var target_top = target_offset.top;
 
        //goto that anchor by setting the body scroll top to anchor top
        $('html, body').animate({scrollTop:target_top}, 500);
    });
});

ScrollTop jQuery

jquery

JavaScript