sfHover = function() {
	var sfEls = document.getElementById("nav").getElementsByTagName("LI");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);

 function validate(f) {
	var ok = true;
	if (f.ContactName.value == '') ok = false;
    if (f.emailAddress.value == '') ok = false;
    if (ok)
      {
      if ( f.Comments.value == '' )
         { alert("You must enter your Message in the text box");
           return false;
         }
       if (!isEmail(f.emailAddress.value))
         { alert("Your email address doesn't appear to be valid, please re-enter it");
           return false;
         }
       
         
      }  
	if(!ok)
		alert("Please enter data in fields marked with *");
	return ok;
 }

 function isEmail (s) {
	var i = 1;
	var sLength = s.length;

    while ((i < sLength) && (s.charAt(i) != "@")) {
		i++;
	}
	if ((i >= sLength) || (s.charAt(i) != "@"))
		return false;
	else
		i += 2;
	while ((i < sLength) && (s.charAt(i) != ".")) {
		i++;
	}
	if ((i >= sLength - 1) || (s.charAt(i) != "."))
		return false;
	else
		return true;
 }