var top = 19;

var next = menu + 1;

var prev = menu - 1;



if (prev < 1) { 

	document.writeln("<a href='sleep_" + top + ".html'><img src='images/btn_prev.gif' width=61 height=12 border=0 alt='Previous'></a>&nbsp;&nbsp;&nbsp;&nbsp;<a href='sleep_" + next + ".html'><img src='images/btn_next.gif' width=41 height=12 border=0 alt='Next'></a>");

} else if (next > top) { 

	document.writeln("<a href='sleep_" + prev + ".html'><img src='images/btn_prev.gif' width=61 height=12 border=0 alt='Previous'></a>&nbsp;&nbsp;&nbsp;&nbsp;<a href='sleep_1.html'><img src='images/btn_next.gif' width=41 height=12 border=0 alt='Next'></a>");

} else {

	document.writeln("<a href='sleep_" + prev + ".html'><img src='images/btn_prev.gif' width=61 height=12 border=0 alt='Previous'></a>&nbsp;&nbsp;&nbsp;&nbsp;<a href='sleep_" + next + ".html'><img src='images/btn_next.gif' width=41 height=12 border=0 alt='Next'></a>");

}



	

//<!-- all double quotes must be \" and no spaces -->