function onLoad(){
		//alert(document.body.scrollHeight);
		//alert(getBodyHeight());
		document.getElementById("content_big").style.height = (document.body.scrollHeight - document.getElementById("header_bg").offsetHeight + 'px');
		document.getElementById("left_column").style.height = (document.body.scrollHeight - document.getElementById("header_bg").offsetHeight + 'px');
	}

	function getBodyHeight() {
		if(window.innerHeight != null)
			return window.innerHeight;
		else
			return document.body.offsetHeight;
}