function _gel(a){return document.getElementById(a)}
function trim(s){return s.replace(/^\s+/,'').replace(/\s+$/,'');}

function isEmail(string){
    if (string.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)
        return true;
    else
        return false;
}