function addEvent(obj,evt,fn){
    if(obj.addEventListener)
        obj.addEventListener(evt,fn,false);
    else if (obj.attachEvent)
        obj.attachEvent('on'+evt,fn);
}

function genRnd(){
    return rdn=Math.floor(Math.random()*10001);
}

function $(e){
    return document.getElementById(e);
}
function $t(e){
    return document.getElementsByTagName(e);
}
function $c(e){
    return document.createElement(e);
}

String.prototype.Trim=function(){
    return this.replace(/\s+$|^\s+/g,"");
}

function isEmail(s){ 
    var pt = /^\s*[\w\-\+_]+(\.[\w\-\+_]+)*\@[\w\-\+_]+\.[\w\-\+_]+(\.[\w\-\+_]+)*\s*$/; 
    return String(s).search (pt) != -1; 
}