function p_load(nm)
{
	var l=nm.lastIndexOf(".");
	this.n=new Image();
	this.n.src=nm;
	this.o=new Image();
	this.o.src=nm.substr(0,l)+"_a"+nm.substr(l);
}

var is_dom=(document.getElementById)?1:0;

function swap_menu(num,state)
{
	if(document.images && is_dom)
	{
		var o=document.getElementById("cell"+num);
		var img=document.images["mn"+num];
		var new_bg=(state) ? im['bg'].o.src : im['bg'].n.src
		var new_img=(state) ? im['mn'+num].o.src : im['mn'+num].n.src;
		o.style.backgroundImage="url("+new_bg+")";
		img.src=new_img;
	}
}

var menu_width=[12,14,22,18,10,24];

function get_pos(num)
{
	var sum=0;
	var ua=navigator.userAgent;
	for(var i=0;i<num;i++) sum+=menu_width[i];
	var w=(ua.indexOf("MSIE")!=-1 && ua.indexOf("Opera")==-1) ? String(document.body.clientWidth) : window.innerWidth;
	return Math.round(w/100*sum);
}

var im=new Array();
im["mn1"]=new p_load("/en/i/m/books.gif");
im["mn2"]=new p_load("/en/i/m/reading.gif");
im["mn3"]=new p_load("/en/i/m/charity.gif");
im["mn4"]=new p_load("/en/i/m/translate.gif");
im["mn5"]=new p_load("/en/i/m/rbo.gif");
im["bg"]=new p_load("/en/i/mbg.gif");