function isEmail(strEmail) {
	var at="@"
	var dot="."
	var lat=strEmail.indexOf(at)
	var lstr=strEmail.length
	var ldot=strEmail.indexOf(dot)
	if (strEmail.indexOf(at)==-1){
	   return false
	}

	if (strEmail.indexOf(at)==-1 || strEmail.indexOf(at)==0 || strEmail.indexOf(at)==lstr){
	   return false
	}

	if (strEmail.indexOf(dot)==-1 || strEmail.indexOf(dot)==0 || strEmail.indexOf(dot)==lstr){
	    return false
	}

	 if (strEmail.indexOf(at,(lat+1))!=-1){
	    return false
	 }

	 if (strEmail.substring(lat-1,lat)==dot || strEmail.substring(lat+1,lat+2)==dot){
	    return false
	 }

	 if (strEmail.indexOf(dot,(lat+2))==-1){
	    return false
	 }

	 if (strEmail.indexOf(" ")!=-1){
	    return false
	 }

	 return true					
}

function validateForm(f){

	if ((f.email.value==null)||(f.email.value=="")) {
		alert("Please enter your email address");
		f.email.focus();
		return false;
	}
	
	if ((f.confirmEmail.value=="")||(f.confirmEmail.value==null)) {
		alert("Please confirm your email address");
		f.confirmEmail.focus();
		return false;
	}
	
	if (isEmail(f.email.value)==false) {
		alert("Please enter a valid email address");
		f.email.focus();
		return false;
	}
	
	if (!(f.email.value==f.confirmEmail.value)) {
		alert("The email addresses entered do not match");
		f.confirmEmail.focus();
		return false;
	}

	return true
 }