function openPopUp(linkURL) {
  window.open(linkURL,'popup','width=498,height=600');
}

function isEmail() {
	var frm = document.forms[val_form];
	str = frm.Email.value;

	var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
	var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");

	if(!r1.test(str) && r2.test(str)) {
		return true;
	} else {
		alert('Please enter a valid e-mail address.');
		return false;
	}
}

function disable_links() {
  var links = document.getElementsByTagName("a");
  for (var i=0; i < links.length; i++) {
    links[i].href = 'javascript:alert("Please complete your registration first.");';
  }
}