if(document.getElementById("l")&&document.getElementById("r")){
	var r_h=document.getElementById("r").scrollHeight;
	var l_h=document.getElementById("l").scrollHeight;
	var h_;
	h_=r_h<l_h?l_h:r_h;
	document.getElementById("l").style.height=document.getElementById("r").style.height=h_+"px";
	document.getElementById("set_h")?document.getElementById("set_h").style.height=h_-8+"px":0;
}