function checkform(form) {
if (form.fname.value.length == 0){
   alert('Please enter your first name.');
   form.fname.focus();
   return false;
}
if (form.lname.value.length == 0){
   alert('Please enter your last name.');
   form.lname.focus();
   return false;
}

var emailStr=form.emailAddress.value

var emailPat=/^(.+)@(.+)$/
	var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
	var validChars="\[^\\s" + specialChars + "\]"
	var firstChars=validChars
	var quotedUser="(\"[^\"]*\")"
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
	var atom="(" + firstChars + validChars + "*" + ")"
	var word="(" + atom + "|" + quotedUser + ")"
	// The following pattern describes the structure of the user
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")
	var matchArray=emailStr.match(emailPat)
	if (matchArray==null) {
	        alert("The email address you entered is not valid, please verify.")
		form.emailAddress.focus();
	        return false;
	}
	var user=matchArray[1]
	var domain=matchArray[2]
	
	// See if "user" is valid 
	if (user.match(userPat)==null) {
	    // user is not valid
	    alert("The email address you entered is not valid, please verify.")
		form.emailAddress.focus();
	    return false;
	}
	var IPArray=domain.match(ipDomainPat)
	if (IPArray!=null) {
	    // this is an IP address
	          for (var i=1;i<=4;i++) {
	            if (IPArray[i]>255) {
	                alert("The email address you entered is not valid, please verify.")
		form.emailAddress.focus();
	                return false;
	            }
	    }
	    return true
	}
	
	// Domain is symbolic name
	var domainArray=domain.match(domainPat)
	if (domainArray==null) {
	        alert("The email address you entered is not valid, please verify.")
		form.emailAddress.focus();
	    return false;
	}
	
	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>4) {
	   // the address must end in a two letter or three letter word.
	   alert("Your email address must end in a valid domain extension.")
		form.emailAddress.focus();
	   return false;
	}
	
	if (domArr[domArr.length-1].length<=3 && len<2) {
	   var errStr="The email address you entered is not valid, please verify."
	   alert(errStr)
		form.emailAddress.focus();
          return false;
	}


//if (form.comments.value.length == 0){
//   alert('Please enter your comments in the space provided.');
//   form.comments.focus();
//   return false;
//}
// form.submit();
 }