<style>
.some{overflow:scroll;}
#div2{overflow:scroll;}
</style>
<div id="div1" style="overflow:scroll;"></div>
<div class="some"></div>
<div id="div2"></div>
var div2 = document.getElementById("div2");
var currentStyle = div2.currentStyle || getComputedStyle(div2, null);
alert(currentStyle.overflow);
