function isValidEmail(EmailAddr) {
    Filtro = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-]{2,})+\.)+([a-zA-Z0-9]{2,})+$/;
    if(Filtro.test(EmailAddr))
        return true;
    else{
        return false;
    }
}
function soloNumeri(myfield, e){
    var key;
    var keychar;
    if(window.event){
        key = window.event.keyCode;
    }else if(e){
        key = e.which;
    }
    keychar = String.fromCharCode(key);
    if((key==null) || (key==0) || (key==8) || (key==9) || (key==13) || (key==27)){ // control keys
        return true;
    }else if(("0123456789,.").indexOf(keychar) > -1){ // caratteri validi
        if((keychar == "," |  keychar == ".") & (document.getElementById(myfield).value.indexOf(",") > -1 | document.getElementById(myfield).value.indexOf(".") > -1)){
            return false;
        }else{
            return true;
        }
    }else{
        return false;
    }
}