两个div自适应高度js解决

不经常写CSS，碰见一个问题是两个不相关div高度想让自动适应，用JavaScript来解决吧！

<mce:script type="text/javascript"><!--window.onload=window.onresize=function(){if(document.getElementById("div_left").clientHeight<document.getElementById("div_right").clientHeight){document.getElementById("div_left").style.height=document.getElementById("div_right").offsetHeight+"px";}else{document.getElementById("div_right").style.height=document.getElementById("div_left").offsetHeight+"px";}}// --></mce:script>