function checkemail(){
  var emailfilter=/^\w+[\+\.\w-]*@([\w-]+\.)*\w+[\w-]*\.([a-z]{2,4}|\d+)$/i
  var returnval=emailfilter.test(document.getElementById('email').value);
  
  if (returnval==false){
    document.getElementById('email_valid').src = 'elemgraph/!OK.gif';
  }else{
    document.getElementById('email_valid').src = 'elemgraph/OK.gif';
  }
  return returnval;
} 

var browser 		= navigator.userAgent.toLowerCase();
var isIE 				= ((browser.indexOf( "msie" ) != -1) && (browser.indexOf( "opera" ) == -1) && (browser.indexOf( "webtv" ) == -1));

function containsDOM(container, containee) {
  var isParent = false;
  do {
    if ((isParent = container == containee))
      break;
    containee = containee.parentNode;
  }
  while (containee != null);
  return isParent;
}

function checkMouseLeave(element, evt) {
  if (element.contains && evt.toElement) {
    return !element.contains(evt.toElement);
  }else if (evt.relatedTarget) {
    return !containsDOM(element, evt.relatedTarget);
  }
}
function f_scrollTop() {
	return f_filterResults (
		window.pageYOffset ? window.pageYOffset : 0,
		document.documentElement ? document.documentElement.scrollTop : 0,
		document.body ? document.body.scrollTop : 0
	);
}
function f_filterResults(n_win, n_docel, n_body) {
	var n_result = n_win ? n_win : 0;
	if (n_docel && (!n_result || (n_result > n_docel)))
		n_result = n_docel;
	return n_body && (!n_result || (n_result > n_body)) ? n_body : n_result;
}