function slidein(){
	var current = document.getElementById("bookin").offsetLeft;
	if(current < 0){
		document.getElementById("bookin").style.left = current + 4 + "px";
		timeoutslidein = setTimeout("slidein();", 5);
		if(current == 0){
			clearTimeout(timeoutslidein);
		}
	}
}
function slideout(){
	var current = document.getElementById("bookin").offsetLeft;
	if(current > -240){
		document.getElementById("bookin").style.left = current - 4 + "px";
		timeoutslideout = setTimeout("slideout();", 5);
		if(current == -240){
			clearTimeout(timeoutslideout);
		}
	}
}