function updateLeftRegionHeight () {

	var left = document.getElementById ( 'left' );

	var centre = document.getElementById ( 'centre' );

	var cHeight = centre.offsetHeight;

	var lHeight = left.offsetHeight;

	

	if ( cHeight > lHeight ) left.style.height = cHeight + 'px';

}



function assignEvent (obj, evt, func) {

	if (obj.addEventListener){

		obj.addEventListener(evt, func, true);

	} else if (obj.attachEvent){

		obj.attachEvent("on" + evt, func);

	}

}



assignEvent (window, 'load', updateLeftRegionHeight);

//assignEvent (window, 'resize', updateLeftRegionHeight);