onscroll element flicker

Has anyone found a solution to the flickering you get when scrolling a sized
div with a fixed header?

//SCROLLS LAYERS TOGETHER
function keepTogether(){
var div1 = document.getElementById('div1Input');
var div2 = document.getElementById('div2Input');
var tbl1Hdr = document.getElementById('table1Hdr');
var tbl1Hdr2 = document.getElementById('table1Hdr2');
div1.scrollTop = div2.scrollTop;
tbl1Hdr.style.top = div1.scrollTop + "px"; //header row-does not flicker
tbl2Hdr.style.top = div2.scrollTop + "px"; //header row flickers as it
floats in place
}