var slide=0;
function slideUpDown(){
	if(slide==0){ 
		$('#coverPopup').animate({ marginTop: '-615px' }); slide=1; 
		$('a#moveBtn').css({'background' : 'url(images/bt_move_down.png) no-repeat scroll center bottom transparent'}); 
	}
	else{ 
		$('#coverPopup').animate({ marginTop: '0' }); slide=0; 
		$('a#moveBtn').css({'background' : 'url(images/bt_move_up.png) no-repeat scroll center bottom transparent'}); 
	}
	return false;
}