function setCookie(id) 
{
cnow=new Date(); 
cnow.setTime(cnow.getTime()+1000*60*15); 
document.cookie="sessionId="+id+"#;expires="+cnow.toGMTString(); 
}

var now = new Date(); 
var ts = now.getTime(); 
var ss = Math.ceil((Math.random()*999999)); 
var sessionId = ts+"-"+ss;
var sessionStr = "sessionId=";
var cookieStr=unescape(document.cookie); 
beginPos=cookieStr.indexOf("sessionId"); 
if (beginPos != -1) {
	endPos=cookieStr.indexOf("#",beginPos); 
	sStr=cookieStr.substring(beginPos, endPos); 
	sessionStr="action=NEW2&"+sStr;
} else {　
	setCookie(sessionId);
	cookieStr=unescape(document.cookie);
	beginPos=cookieStr.indexOf("sessionId");
	if (beginPos != -1) {
		sessionStr="action=NEW1&sessionId="+sessionId; 
	}
}