JavaScript mailbox URL Regular validation code

Web page effect email address regular validation code

function Checkurl () {
var maxlength = 50;
var url = $ ("#tbcommentauthorurl"). Val ();

if (Url.length = = 0) {
Commenturlisvalid = true;
return true;
}
else if (Url.length > MaxLength) {
$ ("#tip_url"). HTML ("Home address does not allow more than" + MaxLength + "characters!) ");
Commenturlisvalid = false;
return false;
}
else if (Url.indexof ("http://")!=0 | | url.indexof (".") < 0) {
$ ("#tip_url"). HTML ("Home address to start with" http://);
Commenturlisvalid = false;
return false;
}
else{
$ ("#tip_url"). HTML ("");
Commenturlisvalid = true;
return true;
}
}

function Checkemail () {
var email = $ ("#tbcommentemail"). Val ();
if (email.length>0) {
var regexp = new RegExp ("w+@" (w|-) +.) +[a-z]{2,3} ");
if (!regexp.test (email)) {
$ ("#tip_email"). HTML ("Please enter the correct email address!");
Commentemailisvalid = false;
}
else{
Commentemailisvalid = true;
$ ("#tip_email"). HTML ("");
}
}
else{
Commentemailisvalid = true;
$ ("#tip_email"). HTML ("");
}
}