function formValidation ( )
{
    valid = true;
	if ( document.registerform.txtEmail.value == "" )
    {
        alert ( "Please enter your e-mail address" );
        valid = false;
    }
	var illegalChars = /\W/;
	var emailFilter=/^.+@.+\..{2,3}$/;
	var illegalChars2= /[\(\)\<\>\,\;\:\\\/\"\[\]]/
	var emailFilter=/^.+@.+\..{2,3}$/;
	 if (!(emailFilter.test(document.registerform.txtEmail.value))) {
		alert("Please enter a valid e-mail address");
		valid = false;
	 }
	if (document.registerform.txtEmail.value.match(illegalChars2)) {
		alert("Please enter a valid e-mail address");
		valid = false;
	 }
    return valid;
}