function Validate()
    {
        var err = false;
        var errMsg = "";
        var mail=new RegExp(); 
        mail =/\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/;
         
        if(document.getElementById("mail").value == "")
        {
            errMsg += "-Enter Email \r\n";
            err = true;
        }
        else 
        {
            if(!mail.test(document.getElementById("mail").value))
            {
                errMsg += "-Enter Valid Email \r\n";
                err = true;
            }
        }
        if(err)
        {
            alert(errMsg);
            return false;
        }
        return true;
    }
document.write('<table class="top"><tr><td valign="bottom" align="right">')
document.write('<form id="form" method="POST" action="submitemail.asp">Please enter your email: <input id="mail" name="mail" class="email" type="text" /><input type="submit" value="Submit" onclick="javascript:return Validate();" class="button" /></form>')
document.write('</td></tr></table>')