var isWin = (navigator.platform == "Win32") || (navigator.platform == "Windows");        
var isIE=navigator.userAgent.indexOf("IE")>0;
var isIE5=navigator.userAgent.indexOf("IE 5.0")>0;
var isIE6=navigator.userAgent.indexOf("IE 6.0")>0;
var isNav=(navigator.appName.indexOf("Netscape")!=-1);
var element;
function $(obj){
	return typeof(obj) == "string" ? document.getElementById(obj) : obj;
}
String.prototype.trim=function(){
	return this.replace(/(^[\s]*)|([\s]*$)/g, "");
};
function hide(el) {
	element = $(el);
	element.style.display = 'none';
}
function show(el) {
	element = $(el);
	element.style.display = '';
}

function toggle(el) {
    el = $(el);
	if(el.style.display=="none"){
		el.style.display='block';
	}else{
		el.style.display='none';
	}
}

function back(num){
	history.go(num);
	return false;
}

function close_box(obj){	
	hide(obj.parentNode);
}


function g(o){return document.getElementById(o);}