var speed=30 ;
var MyMar;
var isM = false;
function mInit() {
	//alert(document.getElementById('demo1').offsetWidth +' : '+ document.getElementById('demo').offsetWidth);



	var $demo = document.getElementById("demo");
	if($demo==null) return;
	var $demo1 = $demo.getElementsByTagName("td")[0];
	var $demo2 = $demo1.nextSibling;
	while ($demo2.nodeType==3) { // 兼容会读取空白元素的浏览器(Firefox/Safari)
		$demo2 = $demo2.nextSibling;
	};
	
	var _speed=30 ;		// 这里设置移动速度
	var _mDo;
	if($demo1.offsetWidth > $demo.offsetWidth) {
		$demo2.innerHTML = $demo1.innerHTML;
		_mDo = setInterval(move, _speed) 
		$demo.onmouseover=function() {clearInterval(_mDo)} 
		$demo.onmouseout=function() {_mDo = setInterval(move, _speed)} 
	}
	// 移动
	function move(){
		if($demo2.offsetWidth-$demo.scrollLeft<=0) {
			$demo.scrollLeft-=$demo1.offsetWidth;
		}else{
			$demo.scrollLeft++;
		} 
	}
}