//iframe的高度随内容自动增大，而不产生下拉滚动条。
		function autoResize() {
		try {
		document.all["iframe_content"].style.height=iframe_content.document.body.scrollHeight;
		}catch(e){}
		}
		function autoResizefoot() {
		try {
		document.all["iframe_foot"].style.height=iframe_foot.document.body.scrollHeight;
		}catch(e){}
		}
		function autoResizeleft() {
		try {
		document.all["iframe_left"].style.height=iframe_left.document.body.scrollHeight;
		}catch(e){}
		}