function ClearMe(el){
     el.value="";
}
function display_id(id,s) {
        var e =document.getElementById(id + "2");
        if (e != null) e.innerHTML="";
        var e =document.getElementById(id);
        if (e != null) e.innerHTML=s;
        return(s=="");
}
function trim(s){
        s = s.replace(/^(\s*)/, ''); 
        s = s.replace(/(\s*)$/, ''); 
        return(s);
}
function emailcheck_string (emailStr) {
        emailStr=trim(emailStr);
        if (emailStr=="") return ("<font class='smallbold_gray' style='color: black;'>Please enter an email address.</font>");
        var emailPat=/^(.+)@(.+)$/
        var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
        var validChars="\[^\\s" + specialChars + "\]"
        var quotedUser="(\"[^\"]*\")"
        var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
        var atom=validChars + '+'
        var word="(" + atom + "|" + quotedUser + ")"
        var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
        var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
        var matchArray=emailStr.match(emailPat)
        if (matchArray==null) {
                return("<font class='smallbold_gray' style='color: black;'>Email address seems incorrect (check @ and .'s)</font>")
        }
        var user=matchArray[1]
        var domain=matchArray[2]
        if (user.match(userPat)==null) {
                return("<font class='smallbold_gray' style='color: black;'>The username doesn't seem to be valid.</font>")
        }
        var IPArray=domain.match(ipDomainPat)
        if (IPArray!=null) {
                for (var i=1;i<=4;i++) {
                        if (IPArray[i]>255) {
                                return("<font class='smallbold_gray' style='color: black;'>Destination IP address is invalid!</font>")
                        }
                }
                return "";
        }
        var domainArray=domain.match(domainPat)
        if (domainArray==null) {
                return("<font class='smallbold_gray' style='color: black;'>The domain name doesn't seem to be valid.</font>")
        }
        var atomPat=new RegExp(atom,"g")
        var domArr=domain.match(atomPat)
        var len=domArr.length
        if (domArr[domArr.length-1].length<2 || 
            domArr[domArr.length-1].length>6) {
                return("<font class='smallbold_gray' style='color: black;'>The address must end in a 2 to 6 letter domain.</font>")
        }
        if (len<2) {
                var errStr="<font class='smallbold_gray' style='color: black;'>This address is missing a hostname!</font>"
                return(errStr)
        }
        return "";
}