function __windowOnLoad()
{
	cdmax = document.getElementById('id_container').offsetHeight;
	
	document.getElementById('id_c_left').style.height = (cdmax) + 'px';
	document.getElementById('id_c_right').style.height = (cdmax) + 'px';
}

if (window.addEventListener) //DOM method for binding an event
	window.addEventListener("load", __windowOnLoad, false)
else if (window.attachEvent) //IE exclusive method for binding an event
	window.attachEvent("onload", __windowOnLoad)
else if (document.getElementById) //support older modern browsers
	window.onload=__windowOnLoad