function validEmailAddress(addr) {
	// addr is a nont null and non-empty string
	if ((addr == null) || (addr == "undefined") || (addr == ""))
		return false;
	var i = addr.indexOf("@");
	// '@' should exist
	if (i < 0)
		return false;
	var name = addr.substring(0, i);
	var domain = addr.substring(i + 1);
	// Name should exist	before '@'
	if (name.length == 0)
		return false;
	// '.' should exist in a domain name
	if (domain.indexOf(".") < 1)
		return false;
	// '.' should not be the last character
	if (domain.length == (domain.indexOf(".")+1))
		return false;
	return true;
}

function IsEmpty(aTextField) {
   if ((aTextField.value.length==0) ||
   (aTextField.value==null)) {
      return true;
   }
   else { return false; }
} 

function ValidateForm(form) {

   if (!validEmailAddress(form.email.value))
   {
      alert('Please Enter A Valid Email Address');
      form.email.focus();
      return false;
   }

   if(IsEmpty(form.realname))
   {
      alert('Please Enter Your Name');
      form.realname.focus();
      return false;
   }

return true;

}

function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	//if (document.images) {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		mnu_home2 = newImage("images/mnu_home2.gif");
		mnu_services2 = newImage("images/mnu_services2.gif");
		mnu_portfolio2 = newImage("images/mnu_portfolio2.gif");
		mnu_contact2 = newImage("images/mnu_contact2.gif");
		preloadFlag = true;
	}
}