function validate_email(field,alerttxt)
{
    with (field)
    {
        apos=value.indexOf("@")
        dotpos=value.lastIndexOf(".")
        if (apos<1||dotpos-apos<2)
            {alert(alerttxt);return false}
        else {return true}
    }
}

function validate_form(thisform)
{
    with (thisform)
    {
    if (validate_email(fromemail,"Not a valid e-mail address!")==false)
        {fromemail.focus();return false}
    var str = firstname.value;
    if(str.length == 0)
        {alert("Please provide first name.");firstname.focus();return false}
    }
}