function tab(which) {
	document.getElementById("tabs").className = "sel_" + which;
	setCookie(tabs_cookie, which);
}

/* cookies functions */
function setCookie (name, name_val) {
	document.cookie = name + "=" + escape (name_val);
}

function getCookieVal (offset) {
	var endstr = document.cookie.indexOf (";", offset);
	if (endstr == -1)
		endstr = document.cookie.length;
	return unescape(document.cookie.substring(offset, endstr));
}

function readCookie (name) {
	var dcookie = document.cookie;
	var cname = name + "=";
	var clen = dcookie.length;
	var cbegin = 0;
	
	while (cbegin < clen) {
		var vbegin = cbegin + cname.length;	  
		if (dcookie.substring(cbegin, vbegin) == cname) {
			var vend = dcookie.indexOf (";", vbegin);
			if (vend == -1)
				vend = clen;
			return unescape(dcookie.substring(vbegin, vend));
		}	
	
		cbegin = dcookie.indexOf(" ", cbegin) + 1;	 
		if (cbegin == 0)
			break;
	}
	return null;
}