/**
 * 回到页面顶部
 **/
function goTop(acceleration, time) {
	acceleration = acceleration || 0.1;
	time = time || 16;
 
	var x1 = 0;
	var y1 = 0;
	var x2 = 0;
	var y2 = 0;
	var x3 = 0;
	var y3 = 0;
 
	if (document.documentElement) {
		x1 = document.documentElement.scrollLeft || 0;
		y1 = document.documentElement.scrollTop || 0;
	}
	if (document.body) {
		x2 = document.body.scrollLeft || 0;
		y2 = document.body.scrollTop || 0;
	}
	var x3 = window.scrollX || 0;
	var y3 = window.scrollY || 0;
 
	// 滚动条到页面顶部的水平距离
	var x = Math.max(x1, Math.max(x2, x3));
	// 滚动条到页面顶部的垂直距离
	var y = Math.max(y1, Math.max(y2, y3));
 
	// 滚动距离 = 目前距离 / 速度, 因为距离原来越小, 速度是大于 1 的数, 所以滚动距离会越来越小
	var speed = 1 + acceleration;
	window.scrollTo(Math.floor(x / speed), Math.floor(y / speed));
 
	// 如果距离不为零, 继续调用迭代本函数
	if(x > 0 || y > 0) {
		var invokeFunction = "goTop(" + acceleration + ", " + time + ")";
		window.setTimeout(invokeFunction, time);
	}
}

/**
 *	搜索输入效果
 */
function searchText(obj,textValue){
	if(obj.value == textValue){
		obj.value = '';
	}
	obj.onblur = function(){
		if(obj.value == '')	{
			obj.value = textValue;	
		}
	}
}

/**
 *	商城公告滚动效果
 */
function link_slide(nood){ 
	var o=document.getElementById(nood);
	window.setInterval(function(){scrollup(o,20,0);},3500); 
} 
function scrollup(o,d,c){ 
	var x = o.getElementsByTagName("li");
	if(d==c){ 
		var t=x[0].cloneNode(true); 
		o.removeChild(x[0]); 
		o.appendChild(t); 
		t.style.marginTop=x[0].style.marginTop='0px'; 
	} 
	else{ 
		var s=3,c=c+s,l=(c>=d?c-d:0); 
		x[0].style.marginTop=-c+l+'px'; 
		window.setTimeout(function(){scrollup(o,d,c-l)},100); 
	} 
}