function writeCookie(name, value, hours){
	var expire = "";
	if(hours != null){
		expire = new Date((new Date()).getTime() + hours * 3600000);
		expire = ";path=/;expires=" + expire.toGMTString();
	}
	document.cookie = name + "=" + escape(value) + expire;
}

function readCookie(name){
	var cookieValue = "";
	var search = name + "=";
	if(document.cookie.length > 0){ 
		offset = document.cookie.indexOf(search);
		if (offset != -1){ 
			offset += search.length;
			end = document.cookie.indexOf(";", offset);
			if (end == -1) end = document.cookie.length;
			cookieValue = unescape(document.cookie.substring(offset, end))
		}
	}
	return cookieValue;
}

function removeCookie(name){
    document.cookie = name + "=; path=/;expires=" + new Date().toGMTString();
}

function attachListener(o, type, listener){
	if(o.attachEvent){
		o.attachEvent("on"+ type, listener);
	}else if(o.addEventListener){
		o.addEventListener(type, listener, false);
	}else alert("attachListener: Can't add event!")
}

	                
function parseXML(text){
	var xmlDOC;
	try{ 
		//ie 
		xmlDOC = new ActiveXObject("Microsoft.XMLDOM"); 
		xmlDOC.loadXML(text); 
	}catch(e){
		try{ 
			//firefox, opera, safari 
			var parser=new DOMParser(); 
			xmlDOC=parser.parseFromString(text, "text/xml"); 
		}catch(e){
			alert("parseXML: The parser of XML is not supported by the browser。");
		}
	} 
	return xmlDOC;
}