Basically I've a a element which on click get to execute:
<a href="#" class="hel" onclick="YPCP1_();">Scroll down</a>
and
function YPCP_(){
    var scroll = $(window).scrollTop();
    window.scrollTo(0, 600);
}
The function works fine and scroll down to 600 just fine. The problem is that it directly jumps to position 600 but I want it to slide down. something like slide down and get to position 600 in 6sec. 
Hope that do not make any confusion and Thanks in Advance ( '_' )
 
    