/*
**通用功能,包括:
getScript_cds \ getElementsByClassName \从URL获得参数值getQueryString\CookieManager cookie管理\四舍五入ifeng_round
×× Author:cici	
** data:2009-12-13
*/

function getScript_cds(src,callback){
	var head=document.getElementsByTagName("head")[0];
	var js=document.createElement("script");
	js.setAttribute("src",src);
	js.onload=js.onreadystatechange=function(){
		if(!this.readyState||this.readyState=="loaded"||this.readyState=="complete"){
			head.removeChild(js);
			if(callback) callback();
		}
	}
	head.appendChild(js);
}
function getElementsByClassName(parentElement,tagName,className){
	var elements=parentElement.getElementsByTagName(tagName);
	var result=[];
	for(var i=0;i<elements.length;i++)
		if((" "+elements[i].className+" ").indexOf(" "+className+" ")!=-1) result.push(elements[i]);
	return result;
}
function ifeng_round(number,digit){
	var multiple=1;
	multiple=Math.pow(10,digit);
	return parseInt(number*multiple+0.5)/multiple;
}
//从URL获得参数值
function getQueryString(name)
 {     
	 var reg = new RegExp("(^|\\?|&)"+ name +"=([^&]*)(\\s|&|$)", "i");       
	 if (reg.test(location.href)) 
		return RegExp.$2.replace(/\+/g, " "); 
	 return "";
 }

var CookieManager = {
	getExpiresDate:function(days, hours, minutes) {
	    var ExpiresDate = new Date();
	    if (typeof days == "number" && typeof hours == "number" && 
	        typeof hours == "number") {
	        ExpiresDate.setDate(ExpiresDate.getDate() + parseInt(days));
	        ExpiresDate.setHours(ExpiresDate.getHours() + parseInt(hours));
	        ExpiresDate.setMinutes(ExpiresDate.getMinutes() + parseInt(minutes));
	        return ExpiresDate.toGMTString();
	    }
	},  
	_getValue:function(offset) {
	    var endstr = document.cookie.indexOf (";", offset);
	    if (endstr == -1) {
	        endstr = document.cookie.length;
	    }
	    return unescape(document.cookie.substring(offset, endstr));
	},
	get:function(name) {
	    var arg = name + "=";
	    var alen = arg.length;
	    var clen = document.cookie.length;
	    var i = 0;
	    while (i < clen) {
	        var j = i + alen;
	        if (document.cookie.substring(i, j) == arg) {
	            return this._getValue(j);
	        }
	        i = document.cookie.indexOf(" ", i) + 1;
	        if (i == 0) break; 
	    }
	    return "";
	},
	set:function(name, value, expires, path, domain, secure) {
	    document.cookie = name + "=" + escape (value) +
	        ((expires) ? "; expires=" + expires : "") +
	        ((path) ? "; path=" + path : "") +
	        ((domain) ? "; domain=" + domain : "") +
	        ((secure) ? "; secure" : "");
	},
	remove:function(name,path,domain) {
	    if (this.get(name)) {
	        document.cookie = name + "=" +
	            ((path) ? "; path=" + path : "") +
	            ((domain) ? "; domain=" + domain : "") +
	            "; expires=Thu, 01-Jan-70 00:00:01 GMT";
	    }
	},
	clear:function(){
		var cookies = document.cookie.split(';');
		for(var i=0; i < cookies.length; i++)
			var cookieName = cookies[i].split('=')[0];
			if(cookieName=='ProductListIds')
			{
				this.remove(cookieName);
			}
	}
}