window.onload=window.onresize=function(){
if(document.getElementById("er-r").clientHeight<document.getElementById("er-l").clientHeight){
document.getElementById("er-r").style.height=document.getElementById("er-l").offsetHeight+"px";
}
else{
document.getElementById("er-l").style.height=document.getElementById("er-r").offsetHeight+"px";
}
}