/*导航*/
function nav() {
	var curID = null;
	var lis = byTag(Elem.first(byId("nav")), "LI");	
	var po = Elem.last(byId("nav"));
	var ps = byTag(Elem.last(byId("nav")), "LI");
	var timeout;
	var a = byTag(po, "A");
	for (var j=0; j<a.length; j++) {
		a[j].onmouseover = function() {			
			clearTimeout(timeout);
		}
		a[j].onmouseout = function() {
			timeout = setTimeout(outhandler, 500);
		}
	}
	var pos = new Array(0,150,300,360,0,745);
	for (var i=1; i<7; i++) {
		(function() {
			var id = i-1;
			var li = lis[i];
			li.onmouseover = function() {
				clearTimeout(timeout);
				if (curID != null) {
					ps[curID].style.display = "none";
				}
				curID = id;
				ps[curID].style.display = "block";
				po.style.paddingLeft = pos[curID]+ "px";
			}
			li.onmouseout = function() {
				timeout = setTimeout(outhandler, 500);
			}
		})();
	}
	function outhandler() {
		ps[curID].style.display = 'none';
	}
	
}


window.readkid = function($) {
	return document.getElementById($);
}
readkid.plugin = {};
readkid.each = function( obj, fn, args ) {
	if ( obj.length == undefined )
		for ( var i in obj )
			fn.apply( obj[i], args || [i, obj[i]] );
		else
			for ( var i = 0, ol = obj.length; i < ol; i++ )
				if ( fn.apply( obj[i], args || [i, obj[i]] ) === false ) break;
}
readkid.motion = function(target,duration, vars) {
	var d = 50;
	var count = duration * 1000 / d;
	for (var i=0; i<=count; i++) {
		(function() {
			var p = i;var base = new Object();
			readkid.each(vars, function(o) {
				base[o] = parseInt(target.style[o]);
				base["unit" + o] = target.style[o].replace(base[o], "");
			});
			
			setTimeout(function() {
				readkid.each(vars, function(o) {
					var change = (base[o] - (base[o]  - vars[o]) *(p/count));
					target.style[o] = change + base["unit" + o];
				});
			}, i * d);
		})();
	}
}
_$ = window.$;
window.$ = readkid;


$.plugin.rolled = function(target) {
	var LINEHEIGHT = 30;
	var DURATION = .6;
	var LOOPLIMIT = 3500;
	
	var ul = target.getElementsByTagName("UL")[0];
	var list = target.getElementsByTagName("LI");
	var index = 0;
	var len = list.length;
	var timeout;
	var time = 0;
	var ltime = 0;
	ul.appendChild(list[0].cloneNode(true));
	list = target.getElementsByTagName("LI");
	ul.style.top = "0px";
	readkid.each(list, function (o) {
		this.onmouseover = function() {
			ltime = new Date().getTime() - time;
			clearTimeout(timeout);
		}
		this.onmouseout = function() {
			timeout = setTimeout(loop, LOOPLIMIT-ltime);
			ltime = 0;
		}
	});
	
	setTimeout(loop, LOOPLIMIT);
	function mov() {
		readkid.motion(ul, DURATION, {top:-LINEHEIGHT *index});
	}
	function loop() {
		if (index == len) {
			ul.style.top = "0px";
			index = 1;
		} else 
			index++;
		mov();
		time = new Date().getTime();
		timeout = setTimeout(loop, LOOPLIMIT);
	}
	
}

/*搜索验证*/
function checkSearch(){
	if(document.getElementById('_keyword').value ==  '' || document.getElementById('_keyword').value == '请输入关键字'){
		alert('关键字不能为空！');
		return false;
	}
}