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    function $_GET(key) {
        var s = window.location.search;
        s = s.match(new RegExp(key + '=([^&=]+)'));
        return s ? s[1] : false;
    }

    function delParam(Url,Prm) {
        var a=Url.split('?');
        var re = new RegExp('(\\?|&)'+Prm+'=[^&]+','g');
        Url=('?'+a[1]).replace(re,'');
        Url=Url.replace(/^&|\?/,'');
        var dlm=(Url=='')? '': '?';
        return a[0]+dlm+Url;
    };

    function addParam(url,param,value) {
        if (url.indexOf("?")+1){
            url += "&"+param+"="+value;
        } else {
            url += "?"+param+"="+value;
        }
        return url;
    }