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

function 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 erase_cookie(name) {
	set_cookie(name,"",-1);
}

function go_logout(){
	top.location = "/log-out";
}

function get_el(element_id){
	return document.getElementById(element_id);
}