flag=true;
flag2=true;

function downmenu()
{
if(flag) document.getElementById("Dmenu").style.display="block";
else document.getElementById("Dmenu").style.display="none";
flag=!flag;
}

function downmenu2()
{
if(flag2) document.getElementById("D2menu").style.display="block";
else document.getElementById("D2menu").style.display="none";
flag2=!flag2;
}


function ob(url) {
	var winname, opt;
	winname = ob.arguments.length > 1 ? ob.arguments[1] : "ebook";

	if (ob.arguments.length > 2) {
		opt = ob.arguments[2];
	}
	else {
		w = Math.round(window.screen.availWidth * 0.9);
		h = Math.round(window.screen.availHeight * 0.9);

		if (w > 1400) w = 1400;
		if (h >  900) h =  900;

		opt = new Array();
		opt.push("width=" + w);
		opt.push("height=" + h);
		opt.push("left=" + Math.round((window.screen.availWidth - w) * 0.5));
		opt.push("top=" + Math.round((window.screen.availHeight - h) * 0.3));
		opt.push("resizable=yes");
		opt = opt.join(",");
	}

	var w = window.open(url, winname, opt);
	return false;
}