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 set_background(){
	var background = get_cookie("coloramaBackground");
	if (background == ""){
		background = "tapet_01.gif";
		set_cookie("coloramaBackground",background,300);
	}
	document.body.style.backgroundImage = "url(_sysImages/" + background + ")";
	//alert("url(_sysImages/" + background + ")");
};

function swap_background(newBg){
	set_cookie("coloramaBackground",newBg,300);
	set_background();
};