function menuHiliteOn(element){
    var el = document.getElementById(element);
    el.className='ForumMenuHilite';
    el.style.cursor='hand';
}
function menuHiliteOff(element){
    var el = document.getElementById(element);
    el.className='ForumMenuItem';
}
function navHiliteOn(element){
    var el = document.getElementById(element);
    el.className='ForumNavHilite';
    el.style.cursor='hand';
}
function navHiliteOff(element){
    var el = document.getElementById(element);
    el.className='ForumNavItem';
}
function emailTopic(url,winname,x,y){
	var options = "toolbar=no,scrollbars=no,location=no,menubar=no,resizable=no,width=" + x + ",height=" + y;
	msgWindow=window.open(url,winname,options);
}
function printTopic(url,winname,x,y){
	var options = "toolbar=no,scrollbars=yes,location=no,menubar=yes,resizable=yes,width=" + x + ",height=" + y;
	msgWindow=window.open(url,winname,options);
}
function viewMember(url,winname,x,y){
	var options = "toolbar=no,scrollbars=yes,location=no,menubar=no,resizable=yes,width=" + x + ",height=" + y;
	msgWindow=window.open(url,winname,options);
}
function modWindow(url,winname,x,y){
	var options = "toolbar=no,scrollbars=auto,location=no,menubar=no,resizable=yes,width=" + x + ",height=" + y;
	msgWindow=window.open(url,winname,options);
}
function IsEmail(field){
    var emailStr=field.value
    var checkTLD=1;
    var knownDomsPat=/^(com|net|org|edu|int|inc|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
    var emailPat=/^(.+)@(.+)$/;
    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 +")*$");
    var matchArray=emailStr.match(emailPat);
    if (matchArray==null) {
        alert("Email address seems incorrect (check @ and .'s)");
        return false;
    }
    var user=matchArray[1];
    var domain=matchArray[2];
    for (i=0; i<user.length; i++) {
        if (user.charCodeAt(i)>127) {
            alert("Ths username contains invalid characters.");
            return false;
        }
    }
    for (i=0; i<domain.length; i++) {
        if (domain.charCodeAt(i)>127) {
            alert("Ths domain name contains invalid characters.");
            return false;
        }
    }
    if (user.match(userPat)==null) {
        alert("The username doesn't seem to be valid.");
        return false;
    }
    var IPArray=domain.match(ipDomainPat);
    if (IPArray!=null) {
        for (var i=1;i<=4;i++) {
            if (IPArray[i]>255) {
                alert("Destination IP address is invalid!");
                return false;
            }
        }
    }
    var atomPat=new RegExp("^" + atom + "$");
    var domArr=domain.split(".");
    var len=domArr.length;
    for (i=0;i<len;i++) {
        if (domArr[i].search(atomPat)==-1) {
            alert("The domain name does not seem to be valid.");
            return false;
        }
    }
    if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1) {
        alert("The address must end in a well-known domain or two letter " + "country.");
        return false;
    }
    if (len<2) {
        alert("This address is missing a hostname!");
        return false;
    }
	return true;
}