var RAreaIniHeight;
if (window.addEventListener) {
    window.addEventListener("load", initRArea, false);
}
else if (window.attachEvent) {
    window.attachEvent("onload", initRArea);
}

function initRArea() {
	RAreaIniHeight = document.getElementById("contentsR").clientHeight;
	resizeRArea();
}

function resizeRArea() {
	var divl = document.getElementById("contentsL");
	var divr = document.getElementById("contentsR");
	if (RAreaIniHeight < divl.clientHeight) {
		divr.style.height = divl.clientHeight + "px";
	}
	else if (RAreaIniHeight < divr.clientHeight) {
		divr.style.height = RAreaIniHeight + "px";
	}
}

function addEvForResize(ev, id) {
    var elem = document.getElementById(id);
	if (elem.addEventListener) {
	    elem.addEventListener(ev, resizeRArea, false);
	}
	else if (elem.attachEvent) {
	    elem.attachEvent("on" + ev, resizeRArea);
	}
}