function writecookie(){
	//document.domain = 'localhost';
	var expires = new Date();
	expires.setTime(expires.getTime() + 24*60*60*365*1000);
	var flag = "is_first_visitor=0";
	document.cookie = flag + ";expires=" + expires.toGMTString() + ";path=/";
}	 
function readcookie(){
	//document.domain = 'localhost';
	var mycookie = document.cookie;
	var isFirstVistor = true;
	if (mycookie != null) {
		var arrmycookie = mycookie.split(";");
		var name = "is_first_visitor";
		for (var i = 0 ; i < arrmycookie.length ; i++) {
			if (arrmycookie[i].indexOf(name) >= 0) {
				isFirstVistor = false;
				break;
			}
		}
	}
	
	if (isFirstVistor) {
		var screenAvailHeight = document.documentElement.scrollHeight;
		var bgNode = document.getElementById('firstVisitImgBg');
		bgNode.style.height = '100%';
		bgNode.style.display = '';
		var leftPos = document.body.clientWidth/2-265;
		var topPos = screen.height/2-90;
		var divElement = document.createElement('div');
		divElement.id = "firstVisitImg";
		divElement.style.cssText = 'position:absolute;top:300px;left:' + leftPos + 'px;z-index:999;width:530px;height:179px;background:url(/theme/ie/images/first_visit.gif)';
		var container = document.getElementById("firstVisitImgContainer");
		container.appendChild(divElement);
		window.setTimeout('removeFirstVisit()',7000);
		writecookie();
	}
}
function removeFirstVisit() {
	var bgNode = document.getElementById('firstVisitImgBg');
	bgNode.style.display = 'none';
	var container = document.getElementById('firstVisitImgContainer');
	divElement = document.getElementById('firstVisitImg');
	container.removeChild(divElement);
}