var app = navigator.appName.toLowerCase();
var ver = navigator.appVersion.toLowerCase();
// get the first character from the string.
ver = parseInt(ver.substring(0,1));

var ie3 = (app.indexOf("microsoft") != -1 && ver <= 3);
var ns2 = (app.indexOf("netscape") != -1 && ver <= 2);
var ns4 = (document.layers);
var ie4 = (document.all && !document.getElementById);
var ie5 = (document.all && document.getElementById);
var ns6 = (!document.all && document.getElementById);

function isRollover() {
	return !(ie3 || ns2);
};

function GetElementByID(target_frame, element_id){
	if(ie4){
		return target_frame.document.all[element_id];
	} else if(ns4){
		return target_frame.document.layers[element_id];	
	} else {
		return target_frame.document.getElementById(element_id);
	};
};

function AddClassName(elm, class_name){
	elm.className += ' ' + class_name;
}

function RemoveClassName(elm, class_name) {
	var re = new RegExp(' ' + class_name, 'g');
	elm.className = elm.className.replace(re, '');
}

function SubmitAction(action) {
	self.document.forms[0].Action.value=action;
	self.document.forms[0].submit()
}