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_about2 = newImage("images/mnu_about2.gif");
		mnu_ourwork2 = newImage("images/mnu_ourwork2.gif");
		mnu_contact2 = newImage("images/mnu_contact2.gif");
		preloadFlag = true;
	}
}

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;

}