//setCookie("test", "tester", null);
//alert(getCookie("test"));
function setCookie(c_name,value,expiredays){
	//alert(c_name + " " + value);
	var exdate=new Date();
	exdate.setDate(exdate.getDate()+expiredays);
	document.cookie=c_name+ "=" +escape(value);//+
	//((expiredays==null) ? "" : ";expires="+exdate.toGMTString());
}

function getCookie(c_name){
	//alert("get cookie: " + c_name);
	if (document.cookie.length>0){
	  c_start=document.cookie.indexOf(c_name + "=");
	  if (c_start!=-1){ 
	    c_start=c_start + c_name.length+1; 
	    c_end=document.cookie.indexOf(";",c_start);
	    if (c_end==-1) c_end=document.cookie.length;
	    return unescape(document.cookie.substring(c_start,c_end));
	    } 
	  }
	return "";
}

function checkCookie()
{
	username=getCookie('username');
	if (username!=null && username!=""){
		alert('Welcome again '+username+'!');
	}else{
		username=prompt('Please enter your name:',"");
		if (username!=null && username!=""){
			setCookie('username',username,365);
		} 
	}
}