var show_abstract = function(html) {
	var e = $('abstract_box');
	e.style.visibility = 'visible';
	e.innerHTML = html;
	Position.prepare();
	e.style.top = (12+Position.deltaY)+'px';
	Effect.Appear(e,{duration: 0});
};
var hide_abstract = function() {
	Effect.Fade('abstract_box',{duration: 0});
}